Madeleine Hull
Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental condition that can cause a wide range of symptoms related to inattention, hyperactivity, and impulsivity. While diet does not cause ADHD, there is evidence that certain foods and nutrients can affect or trigger symptoms in those who have the disorder. Research suggests that a healthy, balanced diet can help manage ADHD symptoms, and some studies have shown a correlation between diets high in refined sugar and higher levels of hyperactivity and attention deficiency. However, the relationship between diet and ADHD is complex and varies from person to person, and there is no one-size-fits-all solution when it comes to dietary interventions for ADHD.
| Characteristics | Values |
|---|---|
| Diet causing ADHD | No clear scientific evidence |
| Diet's role in ADHD | May influence the severity of symptoms; research is conflicting |
| Recommended diet for ADHD | Mediterranean-style diet with fruits, vegetables, and protein-rich options; lower intake of sugar, saturated fat, and cholesterol |
| Supplements | May be recommended for deficiencies; research is mixed |
| Food additives | May interfere with neurotransmitters or cause neuroinflammation that worsens symptoms |
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What You'll Learn
Sugar and artificial additives
While there is no solid evidence that sugar causes ADHD, some studies have reported a modest increase in hyperactivity after eating sugar. Sugar stimulates dopamine in the brain, similar to stimulant drugs, which can cause a child to become fidgety and inattentive. Sugar can also negatively impact the gut. Sugar may also cause overactivity symptoms to intensify in someone who already has ADHD, as it gives them more energy.
Some parents of children with ADHD have observed that their children become more hyperactive after consuming sugar, and that cutting it out of their diets helps them concentrate more. However, experts note that sugar does not cause hyperactivity, and that limiting sugary foods is recommended for other health-related reasons, such as better weight management, reduced risk of diabetes, and improved sleep.
Artificial sweeteners can also negatively affect individuals with ADHD, leading to headaches or learning problems. They can also make sugar cravings worse and disrupt brain functioning. Artificial colorings and flavorings are also known to disrupt brain functioning.
A 14-year-long study published in 2010 concluded that the Western diet, which is high in fat, calories, and sugar, is associated with higher rates of ADHD in children. However, the research only established a correlation and did not conclude that the Western diet causes ADHD.
While there is no clear scientific evidence that ADHD is caused by diet, certain foods may play a role in affecting symptoms in some people. For instance, a nutrient-poor diet may lead to suboptimal blood nutritional biochemistry, which may contribute to the development of ADHD.
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Nutritional deficiencies
Iron
Iron deficiencies have been linked to the development of ADHD in children. Studies have found that iron supplements, along with zinc, improved symptoms in children with ADHD.
Zinc
Similarly, a zinc deficiency has been associated with an increased risk of ADHD. Providing the right amount of zinc has been shown to improve ADHD symptoms.
Vitamin D
Research has found that children with ADHD tend to have lower levels of vitamin D. A small study showed that vitamin D supplements, in combination with prescription medication, improved hyperactivity, inattention, and behaviour scores in children with ADHD.
Magnesium
Some studies have examined the potential link between magnesium deficiency and ADHD, but no clear cause has been established.
Calcium and Vitamin B2
A case-control study in China found that patients with ADHD had lower intakes of calcium and vitamin B2.
Folate, Vitamin B6, and Ferritin
A study in Taiwan found that the ADHD group had lower levels of folate, vitamin B6, and ferritin, and higher MUFA and SFA concentrations than the control group. The authors suggested that a nutrient-poor diet may contribute to the development of ADHD.
While nutritional deficiencies may play a role in ADHD, it is important to note that dietary interventions alone may not be sufficient to manage the condition. A combination of medication and behaviour therapy is currently the most recommended form of treatment for children with ADHD.
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Omega-3 fatty acids
Several studies have found that omega-3 fatty acid supplements have positive effects on ADHD symptoms. For example, researchers at Oregon Health & Science University analyzed data from 16 studies on ADHD and omega-3s and found that supplementing with omega-3s consistently reduced hyperactivity. Other benefits included less inattention, less disobedience, less hostility, and better spelling.
Israeli researchers studied 78 ADHD children with sleep problems, giving them either an omega-3/omega-6 supplement or a placebo. After 10 weeks, the children taking the supplement slept better, were less tired during the day, and were better able to cooperate with others.
German researchers found that supplementing with omega-3s improved "working memory" or short-term recall, which is key to learning.
Scientists at MRC Social, Genetic & Developmental Psychiatry Centre in London studied 180 children with ADHD and 180 without the disorder. They found that the ADHD children had a 60 to 70 percent greater likelihood of a variation in a gene necessary to metabolize fatty acids.
Overall, while there is no single cause of ADHD, omega-3 fatty acid supplements may help to alleviate some of the symptoms.
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Mediterranean diet
There is no solid evidence that ADHD is caused by diet. However, certain foods may play a role in affecting symptoms in a small group of people. Research has shown that eating nutritious meals helps our brains function, but there is no solid evidence showing that sugar or other food items affect ADHD symptoms.
The Mediterranean diet, rich in vegetables, fruits, legumes, nuts, grains, and fish, is often praised for its health benefits. This plant-based diet has been found to have a beneficial effect on mental health. Several studies have found a link between lower adherence to a Mediterranean diet and an increased risk of ADHD diagnosis.
One study of Iranian children aged 7-13 found that those with the highest adherence to the Mediterranean diet had the lowest risk for ADHD. Similarly, a study of Spanish children, where there is a rising rate of ADHD diagnoses, found that children with ADHD showed significantly lower scores on adherence to a Mediterranean diet. These children also consumed less fatty fish, which is a key source of omega-3 fatty acids, and ate more frequently at fast-food restaurants.
Another study of 120 children and adolescents with and without ADHD found that lower adherence to a Mediterranean diet was associated with an ADHD diagnosis. The authors suggested that not only "specific nutrients" but also the "whole diet" should be considered in ADHD.
Overall, while the Mediterranean diet may not directly prevent or treat ADHD, its focus on nutritious whole foods and healthy lifestyle habits can contribute to overall mental and physical well-being.
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Food additives
While there is no clear scientific evidence that ADHD is caused by diet, food choices may affect the severity of symptoms in people with ADHD.
However, it is important to note that the research in this area is still evolving, and more evidence is needed to establish a definitive link between food additives and ADHD symptoms. Individual sensitivity to food additives may also vary. For example, a 2021 study found that elimination diets that identified and avoided specific food triggers improved ADHD symptoms in over half of the participants.
While there is no one-size-fits-all approach to managing ADHD symptoms through diet, some experts recommend providing fresh, nutrient-dense foods, including fruits, vegetables, and protein-rich options. Ensuring adequate hydration can also help manage symptoms.
In summary, while food additives are not proven to cause ADHD, they may impact the severity of symptoms in some individuals. Further research is needed to fully understand the complex relationship between diet and ADHD.
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Frequently asked questions
No, dietary factors don't cause ADHD. However, diet plays a crucial role in health, and some ingredients may trigger hyperactivity.
Diet can influence the severity of ADHD symptoms. Research shows that eating nutritious meals helps our brains function, and when we don’t eat, we struggle to think clearly. Certain foods may play a role in affecting symptoms in a small group of people.
Some experts recommend a Mediterranean-style diet consisting mainly of fruits, vegetables, and protein-rich options. Others recommend staying away from simple carbs and sugary foods and embracing a more well-rounded diet for overall good health.
Some experts recommend that people with ADHD take a 100% vitamin and mineral supplement each day. Other recommended supplements include omega-3 fatty acids, vitamin D, magnesium, iron, and zinc.
