Recently, I participated in the Radboud Talks 2019, a scientific pitch competition, where I was lucky to be one of the eight finalists.

Why Radboud Talks? It is a perfect opportunity to share my work/ideas with the world and to gain more experience regarding presentation skills. They organized two workshops beforehand, where I had the opportunity to learn presentation techniques from professionals (actors and science communication advisors). We also received a lot of feedback, so I really learned a lot about how to present my scientific work to a general audience.

Below you can find the video from the preliminaries based on which I was chosen as a finalist. There you can hear about my research project which is about gut bacteria and their potential role in ADHD (Attention Deficit Hyperactivity Disorder). ADHD is a common worldwide neurodevelopmental disorder. Every person with ADHD has a unique combination of symptoms and challenges. Importantly, it has a significant social impact on patients’ lives, causing disruption at school, work and relationships. Despite its societal importance, progress in understanding disease biology has been slow.

 

The study of the human microbiome has become a very popular topic, because of their revealed importance in human physiology and health maintenance. Numerous studies have reported that gut bacteria may have an effect on our mental health. Some studies showed a potential role of gut bacteria in a psychiatric disorder like depression, autism or Parkinson (1). Above all, diet showed to have a profound effect of ADHD symptoms. This was earlier described in this blog: https://newbrainnutrition.com/investigating-the-effects-of-a-dietary-intervention-in-adhd-on-the-brain/ and we know that diet is one of the main factors influencing gut bacteria. Taking all together, I am curious (and investigating) if gut bacteria play a role in ADHD and if yes what kind of effect do they have on ADHD symptoms.

REFERENCES:
Bastiaanssen, T., Cowan, C., Claesson, M. J., Dinan, T. G., & Cryan, J. F. (2018). Making Sense of … the Microbiome in Psychiatry. The international journal of neuropsychopharmacology22(1), 37–52. doi:10.1093/ijnp/pyy067

 

Please share and like us:

In every classroom, approximately two children are diagnosed with Attention Deficit Hyperactivity Disorder (ADHD). They struggle with attention problems and hyperactive and impulsive behavior. This has negative consequences for these children. For example, they can have difficulties learning, it puts them at risk for other psychiatric problems, and it can cause parent-child relationship problems. Therefore, children with ADHD do need some sort of treatment for optimizing the quality of their lives.

After psycho-education to the child, parents and teacher, medication is often the first choice of treatment because it is evidence-based. However, there is a growing group of parents that do not wish to medicate their child. They are concerned about the side and long-term effects. Thus, these parents seek other treatment. That is where they get stuck: which other effective treatments are available?

In order to develop new treatments, there is a growing field of research focusing on risk factors for ADHD symptoms. One of these risk factors that has been studies increasingly is nutrition. Nutrition plays a role in physical well-being, but could also play a role in psychological well-being and cognitive functioning. Consequently, dietary treatments could be an alternative treatment for children with ADHD. There is a long history of research in nutrition, but there is not enough evidence yet about the cost-effectiveness to implement dietary treatments in clinical health care.

So far, studies examining the effectiveness of a so-called elimination diet showed the strongest effects (1). The aim of an elimination diet is to find out which products trigger ADHD symptoms. However, results of these studies are inconclusive because of several limitations. First, outcome measurements used in these studies were not objective. Second, studies suffered from a sample bias towards highly motivated and educated parents. Third, underlying mechanisms are still unknown. Fourth, long-term effects are unknown. Moreover, it is unknown if an elimination diet is more effective in reducing ADHD symptoms than a healthy diet based on the World Health Organization (WHO) guidelines (2).

We thought: can we take into account these limitations ánd examine the effectiveness of two dietary treatments? This resulted in the TRACE study: ‘Treatment of ADHD with Care as usual versus an Elimination diet’ (TRACE) study. This is the first study to determine the short- and long-term effectiveness and cost-effectiveness of two dietary treatments as initial addition to care as usual as a treatment trajectory for children with ADHD. We will substantially improve upon previous studies by implementing the intervention in non-commercial mental health centers, including blinded and objective measurements, and comparing two dietary treatments with care as usual. Also, understanding the biological effects could inform clinicians to potential markers and targets for preventative or individualized treatment. For this reason, we also examine the underlying biological mechanisms (e.g. mechanisms in the gut and brain) of dietary treatments (TRACE-BIOME and TRACE-MRI studies). We collect blood, stool and saliva samples.

The TRACE study is a two-arm randomized control trial: participants are randomized to either an elimination diet or a healthy diet. The comparator arm includes children who are being treated with care as usual. Currently, we included in each dietary treatment arm about half of the targeted participants (N=81 in each dietary group). In the care as usual group, we included about one-third of the targeted participants (N=60). We hope to finish inclusion around January 2020.

I am really looking forward to the results and hope to share this with you in a couple of years! If you have any questions, feel free to contact us via trace@karakter.com

REFERENCES
(1) Nigg, J. T., Lewis, K., Edinger, T., & Falk, M. (2012). Meta-analysis of attention- deficit/hyperactivity disorder or attention-deficit/hyperactivity disorder symptoms, restriction diet, and synthetic food color additives. Journal of the American Academy of Child & Adolescent Psychiatry, 51(1), 86-97. https://doi.org/10.1016/j.jaac.2011. 10.015 .
Link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4321798/

(2) Izquierdo Pulido, M. L., Ríos Hernández, A., Farran, A., & Alda, J. Á. (2015). The role of diet and physical activity in children and adolescents with ADHD. Recent Advances in Pharmaceutical Sciences V, 2015, Research Signpost. Chapter 4, p. 51-64.
Link: http://diposit.ub.edu/dspace/bitstream/2445/67543/1/T_1444299316Munozv%204.pdf

Please share and like us:

Loss of appetite is among the most common side effects of stimulant for ADHD. Across studies, approximately 20% of patients with ADHD who were treated with stimulants reported a loss of appetite [1,2]. Weight loss is also quite common, as are digestive problems [3]. Together, such side effects are often referred to as “gastro-intestinal adverse events”. But why do stimulants change the way we go about eating? And what could this tell us about ADHD itself?

Appetite can arise in response to physical cues, such as an empty stomach or low blood sugar. Psychological cues can also influence our appetite; for instance, we may get hungry when we watch other people eat, or when we are bored. For most people, eating is a pleasant and rewarding activity. In the human brain, pleasure, reward, craving and, thus, appetite, have everything to do with dopamine. More specifically, with dopamine levels in the striatum, a cluster of neurons at the very base of the forebrain. The striatum is strongly connected with the prefrontal cortex. The prefrontal cortex exercises cognitive control over the urges of the striatum: when we’re hungry, the striatum makes us crave high-caloric, high-fat, or sweet foods; at the same time, our more rational prefrontal cortex helps us make responsible food choices.

Interestingly, ADHD also has everything to do with dopamine and the striatum. Dopamine levels in the striatum are slightly ‘off’ in individuals with ADHD. As a result, people with ADHD feel a higher urge to seek pleasant experiences, and less prefrontal control over this urge. Impulsivity, a prominent feature of ADHD, can be viewed as a failure to sufficiently activate the prefrontal cortex. Finding a balance between pleasure-seeking on the one hand, and rational decision-making on the other, can be difficult for all of us. However, for people with ADHD whose dopamine balance is slightly off, making healthy, non-impulsive decisions about what to eat may be even more challenging. Indeed, overweight, obesity and diabetes seem to be more common in people with ADHD compared to people without ADHD [4].

Stimulants such as methylphenidate and dexamphetamine can restore the dopamine balance in the brain. This may result in less craving for food (as well as for other pleasant activities) and more control over impulsive urges. It is thus not very surprising that stimulant medications may cause a loss of appetite or even weight loss. Interestingly, stimulants are sometimes used to treat obesity and certain eating disorders as well. Especially for eating disorders involving impulsive eating, such as bulimia nervosa and binge-eating disorder, stimulant treatment could be promising. [5]

There is one other interesting angle on stimulants, dopamine, and eating. Did you know that most of the dopamine in your body is not located in the brain? In fact, a substantial proportion of all dopamine-related processes in the human body take place in the gut. Throughout the gastro-intestinal tract, dopamine receptors are abundant. Therefore, in addition to the indirect effects described above (i.e., via craving and/or impulse control), stimulants may have direct effects on eating behaviours as well. Unfortunately, we know very little about such direct effects.

REFERENCES
[1] Storebø, Ramstad, Krogh, Nilausen, Skoog, Holmskov et al. (2015). Methylphenidate for attention-deficit/hyperactivity disorder in children and adolescents: Cochrane systematic review with meta-analyses and trial sequential analyses of randomised clinical trials. Cochrane Database Syst Rev (11):CD009885. doi: 10.1002/14651858.CD009885.pub2

[2] Storebø, Pedersen, Ramstad, Kielsholm, Nielsen, Krogh et al. (2018) Methylphenidate for attention deficit hyperactivity disorder (ADHD) in children and adolescents – assessment of adverse events in non-randomised studies. Cochrane Database Syst Rev 5:CD012069. doi: 10.1002/14651858.CD012069.pub2

[3] Holmskov, Storebø, Moreira-Maia, Ramstad, Magnusson, Krogh et al. (2017) Gastrointestinal adverse events during methylphenidate treatment of children and adolescents with attention deficit hyperactivity disorder: A systematic review with meta-analysis and Trial Sequential Analysis of randomised clinical trials. PLoS One 12(6):e0178187. doi: 10.1371/journal.pone.0178187

[4] Cortese, Moreira-Maia, St Fleur, Morcillo-Peñalver, Rohde & Faraone (2016). Association Between ADHD and Obesity: A Systematic Review and Meta-Analysis. Am J Psychiatry 173(1):34-43. doi: 10.1176/appi.ajp.2015.15020266

[5] Himmerich & Treasure (2018). Psychopharmacological advances in eating disorders. Expert Rev Clin Pharmacol, 11(1):95-108. doi: 10.1080/17512433.2018.1383895

Please share and like us:

We have discussed the association between ADHD and obesity in our first blog (https://newbrainnutrition.com/adhd-and-obesity-does-one-cause-the-other/), briefly summarized, evidence from various study designs suggested that shared etiological factors might contribute to the above association. Recently, a large genome-wide association study (GWAS) on risk genes for ADHD reported a significant genetic correlation between ADHD and a higher risk of overweight and obesity, increased BMI, and higher waist-to-hip ratio, which further supported that there could be genetic overlap between obesity and ADHD (1).

Considering the previously described occurrence of unhealthy dietary intake in children and adolescents with ADHD in our second blog (https://newbrainnutrition.com/unhealthy-diets-and-food-addictions-in-adhd/), along with the fact that bad eating behaviours are crucial factors for the development of obesity, We can speculate that the shared genetic effects between ADHD and unhealthy dietary intake may also explain the potential bidirectional diet-ADHD associations. Is there any available evidence to support the above hypothesis?

To date, dopaminergic dysfunctions underpinning reward deficiency processing (or neural reward anticipation), was reported as a potential shared biological mechanism, through which the genetic variants could increase both the risk for ADHD and unhealthy dietary intake or obesity. Via the Gut-Brain axis, a two-way and high-speed connection, the gut can talk to the brain directly. According to the study (2), a higher proportion of bacteria that produce a substance that can be converted into dopamine was found in the intestines of people with ADHD than those without ADHD. Using functional magnetic resonance imaging (fMRI), they further found that the participants with more of these bacteria in their intestines displayed less activity in the reward sections of the brain, which constitutes one of the hallmarks of ADHD. We are therefore proposing the idea that there could be a biological pathway- ‘dietary habits-gut (microorganism)-reward system (dopamine)-ADHD’, through which the shared genetic effects between ADHD and unhealthy dietary intake may play a role.

In order to determine whether the genetic overlap between ADHD and dietary habits actually exists, we will in our next Eat2beNice project use twin methodology and unique data from the Swedish Twin Register. We will keep you updated!

This was co-authored by Henrik Larsson, professor in the School of Medical Science, Örebro University and Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Sweden.

Authors:
Lin Li, MSc, PhD student in the School of Medical Science, Örebro University, Sweden.

Henrik Larsson, PhD, professor in the School of Medical Science, Örebro University and Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Sweden.

REFERENCES:
1. Demontis D, Walters RK, Martin J, Mattheisen M, Als TD, Agerbo E, et al. Discovery of the first genome-wide significant risk loci for attention deficit/hyperactivity disorder. Nature genetics. 2019;51(1):63.

2. Aarts E, Ederveen TH, Naaijen J, Zwiers MP, Boekhorst J, Timmerman HM, et al. Gut microbiome in ADHD and its relation to neural reward anticipation. PLoS One. 2017;12(9):e0183509.

Please share and like us:

Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder with an estimated prevalence rate of 5.3% among children and of about 2.5% among adults. It is characterized by a persistent pattern of inattention and/or hyperactivity-impulsivity, being associated with significant impairment of social, academic, and occupational functioning across the lifespan.

However, despite many efforts, the exact etiology of ADHD still remains unknown and data about modificable risk and protective factors are largely lacking. Recent evidence has suggested an association between inflammation, immunological disturbances and ADHD. Supporting this idea, an increased incidence of immune-mediated disorders (e.g. asthma, allergic rhinitis, atopic dermatitis, allergic conjunctivitis, psoriasis, thyrotoxicosis or type 1 diabetes) accompanied by elevated serum/plasma and cerebrospinal levels of inflammatory markers (especially interleukin (IL)-6) or auto-antibody levels (e.g. antibasal ganglia antibodies, antibodies against the dopamine transporter) have been found in these patients.

Importantly, recent studies have shown the gut flora as an important immunoregulator (1-3) and it is hypothesized that an imbalance in the gut microbiota (dysbiosis) may have a negative effect on cerebral development and behavior (4). About 95% of all circulating serotonin, dopamine or noradrenaline precursors are produced by our gut microbiota, being this ‘enteric nervous system’ bidirectional connected to the central nervous system through hormonal or immune/inflammatory pathways.

In line with this, recent findings suggest that some aliments as probiotics can not only revert dysbiosis, but also modulate brain neurodevelopment, activity and improve cognition, mood and behavior due to their immunoregulatory and anti-inflammatory properties (5-7).

Therefore, understanding the microbiota and how the gut connects to the brain would be important both for the better comprehension of the biological bases that underlie some psychiatric disorders such as ADHD, as for the future development of new evidenced-based drugs for these conditions.

This was co-authored by Josep Antoni Ramos-Quiroga, MD PhD psychiatrist and Head of Department of Psychiatry at Hospital Universitari Vall d’Hebron in Barcelona, Spain. He is also professor at Universitat Autònoma de Barcelona.

REFERENCES:

1. Felix KM, Tahsin S, Wu HJ. Host-microbiota interplay in mediating immune disorders. Ann N Y Acad Sci. 2018; 1417(1):57-70.

2. Yadav SK, Boppana S, Ito N, Mindur JE, Mathay MT, Patel A, et al. Gut dysbiosis breaks immunological tolerance toward the central nervous system during young adulthood. Proc Natl Acad Sci U S A.2017; 114(44): E9318-27.

3. Mandl T, Marsal J, Olsson P, Ohlsson B, Andreasson K. Severe intestinal dysbiosis is prevalent in primary Sjögren’s syndrome and is associated with systemic disease activity. Arthritis Res Ther.2017;19(1):237.

4. Rogers GB, Keating DJ, Young RL, Wong ML, Licinio J, Wesselingh S. From gut dysbiosis to altered brain function and mental illness: mechanisms and pathways. Mol Psychiatry. 2016; 21(6):738-48.

5. Slykerman RF, Kang J, Van Zyl N, Barthow C, Wickens K, Stanley T, et al. Effect of early probiotic supplementation on childhood cognition, behavior and mood. A randomized, placebo-controlled trial. Acta Paediatr.2018; 107(12):2172-78.

6. Kane L, Kinzel J. The effects of probiotics on mood and emotion. JAAPA. 2018; 31(5):1-3.

7. Mayer EA. Gut feelings: the emerging biology of gut-brain communication. Nat Rev Neurosci.2011;12(8):453-66

 

Please share and like us:

Recent research (1,2) on children and adolescents has reported that elevated levels of ADHD symptoms are positively associated with unhealthy dietary habits, including a higher consumption of refined sugars, processed food, soft drink, instant noodles, and a lower intake of vegetables and fruits. However, the link between low-quality diets and risk of ADHD in adults is still not well established, which would be further explored in the ongoing Eat2beNICE research project.

What is the underlying mechanism for an association between ADHD and unhealthy dietary habits? There is still no clear answer. Nemours’ potential biological pathways, by which dietary intake could have an impact on mental health, has been proposed in the literature (2). For example, iron and zinc are cofactors for dopamine and norepinephrine production (essential factors in the etiology of ADHD), so unbalanced diet with lower levels of iron and zinc may further contribute to the development of ADHD. However, we cannot overlook the possibility of a bi-directional relationship between diet quality and ADHD, especially when the interest in the concept of “food addiction” has received increased attention.

Food addiction refers to being addicted to certain foods (e.g. highly processed foods, highly palatable foods, sweet and junk foods) in a similar way as drug addicts are addicted to drugs. Animal models (3) have suggested that highly processed foods may possess addictive properties. Rats given high-sugar or high-fat foods display symptoms of binge eating, such as consuming increased quantities of food in short time periods, and seeking out highly processed foods despite negative consequences (e.g. electric foot shocks). One human study (4) found that individuals with high levels of ADHD-like traits (e.g. high levels of impulsively, disorganised, attention problems) were more likely to suffer from problematic eating behaviour with overconsumption of specific highly palatable foods in an addiction-like manner. Therefore, food addiction may, just as substance abuse, be over-represented among individuals with ADHD.

Thus, it seems there could be a vicious cycle between unhealthy dietary habits and ADHD: ADHD may lead to a worse choice of diet, lowering the health quality, which could eventually exacerbate ADHD symptoms. We will further test the bidirectional diet-ADHD associations in the ongoing Eat2beNice project.

This was co-authored by Henrik Larsson, professor in the School of Medical Science, Örebro University and Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Sweden.

AUTHORS:
Lin Li, MSc, PhD student in the School of Medical Science, Örebro University, Sweden.
Henrik Larsson, PhD, professor in the School of Medical Science, Örebro University and Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Sweden.

REFERENCES:
1. Kim KM, Lim MH, Kwon HJ, Yoo SJ, Kim EJ, Kim JW, et al. Associations between attention-deficit/hyperactivity disorder symptoms and dietary habits in elementary school children. Appetite. 2018;127:274-9.

2. Rios-Hernandez A, Alda JA, Farran-Codina A, Ferreira-Garcia E, Izquierdo-Pulido M. The Mediterranean Diet and ADHD in Children and Adolescents. Pediatrics. 2017;139(2).

3. Gearhardt AN, White MA, Potenza MN. Binge Eating Disorder and Food Addiction. Curr Drug Abuse Rev. 2011;4(3):201-7.

4. Ptacek R, Stefano GB, Weissenberger S, Akotia D, Raboch J, Papezova H, et al. Attention deficit hyperactivity disorder and disordered eating behaviors: links, risks, and challenges faced. Neuropsychiatr Dis Treat. 2016;12:571-9.

Please share and like us:

A little while ago, this blog featured an entry by Annick Bosch on the TRACE study, an amazing intervention study using the Elimination Diet to treat ADHD in kids (https://newbrainnutrition.com/adhd-and-elimination-diet/). Very shortly summarized, the Elimination Diet entails that participants can only eat a very restricted set of foodstuffs for several weeks, which can greatly reduce the number of ADHD symptoms in some kids. Subsequently, new foodstuffs are added back into the diet one by one, all the time checking that ADHD symptoms do not return. This ensures that every child for which the Elimination Diet proves successful ends up with a unique diet which suppresses their ADHD symptoms.

Now this is a fascinating study, since it indicates a direct influence of diet on ADHD behavior. What we know from the neurobiology of ADHD, is that it is caused by a myriad of relatively small changes in the structure, connectivity and functioning of several brain networks 1. For the most common treatments of ADHD, like medication with methylphenidate 2, we can quite accurately see the changes these interventions have on brain functioning. However, for the Elimination Diet, this has not been studied before at all. This is why we are now starting with the TRACE-MRI study, where kids that participate in a diet intervention in the TRACE program, are also asked to join for two sessions in an MRI scanner. Once before the start of the diet, and once again after 5 weeks, when the strictest phase of the Elimination Diet concludes. In the MRI scanner, we will look at the structure of the brain, at the connectivity of the brain, and at the functioning of the brain using two short psychological tasks. We made a short vlog detailing the experience of some of our first volunteers for this MRI session.

 

 

With the addition of this MRI session, we hope to be able to see the changes in brain structure and function over the first 5 weeks of the diet intervention. This will help us establish a solid biological foundation of how diet can influence the brain in general, and ADHD symptoms specifically. It can also show us if the effect of the Elimination Diet is found in the same brain networks and systems which respond to medication treatment. And lastly, we can see if there is a difference in the brains for those participants for whom the diet has a strong effect versus those where the diet does little or nothing to improve their ADHD symptoms. This can then help us identify for which people a dietary intervention would be a good alternative to standard treatment.

We will update you on the TRACE-MRI study and on the developments in this field right here on this blog!

 

REFERENCES
Faraone, S. V et al. Attention-deficit/hyperactivity disorder ­­­. Nat. Rev. Dis. Prim. 1, (2015).

Konrad, K., Neufang, S., Fink, G. R. & Herpertz-Dahlmann, B. Long-term effects of methylphenidate on neural networks associated with executive attention in children with ADHD: results from a longitudinal functional MRI study. J. Am. Acad. Child Adolesc. Psychiatry 46, 1633–41 (2007).

Please share and like us:

We have talked before about how ADHD has been associated with obesity and the mechanisms implicated on it. I would like to explain more about this important subject so you can understand what dietary changes you can make to avoid the risk of weight gain. Most of the authors attribute the presence of obesity in ADHD individuals to disorder eating patterns, especially overeating, that means that these people are eating a higher amount of calories per day in comparison of individuals without ADHD. When a person consumes more calories or food than their body needs they start to gaining weight and this happens to all kind of people, I’m not talking only about those who have ADHD, and that becomes a health problem.

Nevertheless, there is a recent study that suggests that ADHD-obesity relationship was linked to unhealthy food choices, rather than overeating behavior (1). This means that ADHD individuals are eating the same amounts of calories per day as healthy ones, but their food choices are not good enough to meet the dietary recommendations and can lead to nutritional deficiencies that have been observed on these patients (2,3). These kinds of patients tend to eat more processed meat, unhealthy snacks, and refined cereals; instead of consuming healthy food choices like vegetables, fruits, whole grains, nuts, and fish.

We can suggest that this problem it may be due to the fact that there is a lack of information related to nutrition, so it is easy to get confused on which food products are healthy and which are not.

When you go to the supermarket, you will find a lot of food options that have a label that says “light” or “healthy,” and you may buy them without analyzing if they are genuinely healthy.

So the question is “how can you know if a product is healthy or not?”

First of all, you should opt to buy fresh products such as fruits, vegetables and fish (foods that are rich in vitamins and minerals needed to maintain our mental health in good shape). And avoid consuming fast, packaged or canned food because these kinds of products contain a lot of sodium, sugar, fat, preservatives, additives and components that in high amounts can lead to health issues.

Second, if you need to buy food products that are packaged or canned, you should be able to read and understand the nutritional information and ingredients before you buy them to be sure they are the healthiest options on the market.

Here I share an example on what to search on nutrition facts labels of food products to make the right selection.

For more information on how to understand and use the nutrition facts label you can visit: www.fda.gov/food/labelingnutrition/ucm274593.htm#see3

This was co-authored by Josep Antoni Ramos-Quiroga, MD PhD psychiatrist and Head of Department of Psychiatry at Hospital Universitari Vall d’Hebron in Barcelona, Spain. He is also a professor at Universitat Autònoma de Barcelona.

REFERENCES
1. Hershko S, Aronis A, Maeir A, Pollak Y. Dysfunctional Eating Patterns of Adults With Attention Deficit Hyperactivity Disorder. J Nerv Ment Dis [Internet]. 2018;206(11):870–4.

2. Kotsi E, Kotsi E, Perrea DN. Vitamin D levels in children and adolescents with attention-deficit hyperactivity disorder (ADHD): a meta-analysis. Atten Defic Hyperact Disord [Internet]. Springer Vienna; 2018.

3. Landaas ET, Aarsland TIM, Ulvik A, Halmøy A, Ueland PM, Haavik J. Vitamin levels in adults with ADHD. Br J Psychiatry Open [Internet]. 2016;2(6):377–84.

Please share and like us:

When Alice’s mother first contacted our team to get more information on the dietary intervention at New Brain Nutrition, she mentioned that her daughter seems to be on edge all the time. On a typical day, Alice would be triggered easily over seemingly small things and stay upset for a long time. She told us that these emotional problems caused not only very strained and cheerless moments on the weekends and evenings, they also interfered notably with Alice’s social life. In between her angry or sad moments, Alice seems to be a perfectly happy and energetic 11-year old. Alice’s attention problems didn’t obstruct a healthy didactic development since she started ADHD-medication. However, the emotional problems were still present and seemed to cause severe impairment in social interactions, within the family and with peers. Therefore, her mother asked: Could we please try a dietary intervention to see if Alice’s nutrition may play a role in these problems?

Faraone[1] distinguishes two features in these kind of emotional problems: Emotional Impulsivity and Deficient Emotional Self-Regulation. Some children may experience explosive anger but also recover quickly from it. These children experience high Emotional Impulsivity but low Deficient Emotional Self-Regulation. Alice however, based on her mother’s narrative, seems to experience both high Emotional Impulsivity and high Deficient Emotional Self-Regulation.

The second week into the Elimination Diet treatment, the researcher checks in with the family: She’s still edgy and irritable for most of the time, her mother says, but she seems to break out of it a whole lot sooner. The other day her brother Daniel came home, telling Alice he ate lots of non-elimination diet snacks at his friend’s house. Understandably, Alice became upset but it didn’t last as long as her parents expected. In other words: The Emotional Impulsivity hadn’t decreased yet, but the Deficient Emotional Self-Regulation had.

By the end of the first 5 weeks of the dietary intervention, Alice’s parents reported a convincing decrease in emotion regulation problems. The teacher also reported that the attention problems had stabilized, as much as they did with the ADHD-medication that Alice had before. The family decided to continue the Elimination Diet and start with the re-introduction phase. Every two weeks a new product was re-introduced to see if this may elicit symptoms. This was probably the most interesting period for the family, as emotion regulation problems and attention problems arose and subsided over different phases.

After one year, Alice and her family had figured out a set of foods that, when eliminated from her diet, helped diminishing both the attention problems and emotional problems. Alice is less responsive to emotional triggers and more balanced during social interactions. Alice’s personalized diet or personalized nutrition is based on her experiences and symptoms during the dietary intervention. Her mother is very glad that they discovered this lifestyle intervention as an alternative to their previous treatment with ADHD-medication.

Writers note: This is the story of one individual participating in the New Brain Nutrition study. Evaluating the role of nutrition in treatment of mental health with scientific evidence is part of our future.

More information can be found in [1] Faraone S.V., Rostain A.L., Blader J., Busch B., Childress A.C., Connor D.F., & Newcorn J.H. (2018). Practitioner Review: Emotional dysregulation in attention‐deficit/hyperactivity disorder – implications for clinical recognition and intervention. Journal of Child Psychology and Psychiatry. https://doi.org/10.1111/jcpp.12899

Please share and like us:

Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopment disorder characterized by inattention or hyperactivity–impulsivity, or both. It might seem paradoxical, but many studies indicate that individuals with a diagnosis of ADHD suffer from overweight and obesity. Therefore, it is important to understand the underlying mechanism that put individuals with ADHD at risk for obesity.

 Evidence from within-individual study
A systematic review and meta-analysis (1) based on 728,136 individuals from 42 studies, suggested a significant association between ADHD and obesity both in children/adolescents and adults. The pooled prevalence of obesity was increased by about 70% in adults with ADHD and 40% in children with ADHD compared with individuals without ADHD. However, due to the lack of longitudinal and genetically-informative studies, the meta-analysis was unable to explain the exact direction of association and the underlying etiologic mechanisms. There are several potential explanations:

  • ADHD causing obesity: The impulsivity and inattention components of ADHD might lead to disordered eating patterns and poor planning lifestyles, and further caused weight gain.
  • Obesity causing ADHD: Factors associated with obesity, for example dietary intake, might lead to ADHD-like symptoms through the microbiota-gut-brain axis.
  • ADHD and obesity may share etiological factors: ADHD and obesity may share dopaminergic dysfunctions underpinning reward deficiency processing. So the same biological mechanism may lead to both ADHD and obesity. This is difficult to investigate within individuals, but family studies can help to test this hypothesis.

We will further investigate these possibilities in the Eat2beNICE research project by using both perspective cohort study and twin studies.

Evidence from a recent within-family study
Recently, a population-based familial co-aggregation study in Sweden (2) was conducted to explore the role of shared familial risk factors (e.g. genetic variants, family disease history) in the association between ADHD and obesity. They identified 523,237 full siblings born during 1973–2002 for the 472,735 index males in Sweden, and followed them until December 3, 2009. The results suggest that having a sibling with overweight/obesity is a risk factor for ADHD. This makes it likely that biological factors (that are shared between family members) increase the risk for both ADHD and obesity.

Evidence from across-generation study
Given that both ADHD and obesity are highly heritable complex conditions, across-generation studies may also advance the understanding of the link between ADHD and obesity.

A population-based cohort study (3) based on a Swedish nationwide sample of 673,632individuals born during 1992-2004, was performed to explore the association between maternal pre-pregnancy obesity and risk of ADHD in offspring. The sibling-comparison study design was used to test the role of shared familial factors for the potential association. The results suggest that the association between maternal pre-pregnancy obesity and risk of ADHD in offspring might be largely explained by shared familial factors, for example, genetic factors transmitted from mother to child that contribute to both maternal pre-pregnancy obesity and ADHD.

Together, based on previous evidence from various study designs, there is evidence to suggest that the association between ADHD and obesity mainly is caused by shared etiological factors. However, future studies on different population are still needed to further test these findings.

REFERENCES:
1. Cortese S, Moreira-Maia CR, St Fleur D, Morcillo-Penalver C, Rohde LA, Faraone SV. Association Between ADHD and Obesity: A Systematic Review and Meta-Analysis. The American journal of psychiatry. 2016;173(1):34-43.

2. Chen Q, Kuja-Halkola R, Sjolander A, Serlachius E, Cortese S, Faraone SV, et al. Shared familial risk factors between attention-deficit/hyperactivity disorder and overweight/obesity – a population-based familial coaggregation study in Sweden. J Child Psychol Psychiatry. 2017;58(6):711-8.

3. Chen Q, Sjolander A, Langstrom N, Rodriguez A, Serlachius E, D’Onofrio BM, et al. Maternal pre-pregnancy body mass index and offspring attention deficit hyperactivity disorder: a population-based cohort study using a sibling-comparison design. Int J Epidemiol. 2014;43(1):83-90.

Please share and like us: