Definitely. Some years I found out that low fat diets are associated with depression. Also, long chain Omega -3 fats improve intelligence.
Here's something on the effects of sugar on some people. "But a new study published in the journal Evolution and Human Behavior just shed light on some alarming newside effects attached to the overconsumption of sugary foods. The research from the University of Colorado Anschutz Medical Campus suggests that sugar could play a key role in driving several manic behaviors, including aggressive behavior, bipolar disorder, and attention deficient hyperactivity syndrome (ADHD)." New Study Links Eating Sugar to Manic Behaviors | Eat This Not That
