If your son has ADHD that only thing that could really be adding to his hyper activity is sugar and caffeine. It is recommended to remove these from a child's diet who has ADHD.
There have been some links between ADHD and nutrition. Some studies have indicated that a poor diet can worsen ADHD symptoms and a good diet can improve them.
Many experts in the research field have discovered that limiting sugar and caffiene in the diet of children with ADHD can help curb symptoms. However, there is no scientific link between diet and ADHD as of yet.
There is no proven evidence of a link between the food you eat and ADHD, but there are some health professionals which believe that a low carb, high protein diet can help curb ADHD symptoms.
carefully controlled follow-up studies have uncovered no link between food allergies and ADHD
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Research suggests there may be a link between ADHD and night terrors, as both can involve disruptions in sleep patterns. Children with ADHD are more likely to experience sleep disturbances, which can contribute to night terrors. Additionally, the heightened emotional and behavioral challenges associated with ADHD may exacerbate sleep issues. However, more studies are needed to fully understand the relationship between the two conditions.
Research indicates a potential link between ADHD and an increased risk of engaging in criminal behavior, particularly in adolescents and young adults. Individuals with ADHD may struggle with impulsivity, behavioral regulation, and decision-making, which can contribute to higher rates of delinquency. However, it's important to note that not all individuals with ADHD engage in criminal activities, and environmental factors, such as socioeconomic status and support systems, also play a significant role. Overall, while there is some correlation, it is not a definitive cause-and-effect relationship.
According to the Mayo Clinic, "food additives include artificial colors, artificial sweeteners and preservatives. There's no solid evidence that food additives cause attention-deficit/hyperactivity disorder (ADHD)."
It may be a case to case basis. Since people with ADHD normally have difficulty in paying attention during a conversation or having an inattention to detail, the process of information on their brain might not work as fast as a normal person's would. However, many have had observed that those who have ADHD are one of the most intelligent persons in the world, i.e Bill Gates. SEE RELATED LINK
The link is that an unhealthy diet can throw off your sugar levels and cause you to gain weight.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1403673/ This article explores the link between those two things you have mentioned. I hope you find it useful.