Of course, most children won't fall so neatly into these three categories. There are seven different combinations of these three basic types. Or he or she might be a combination of all three. An excess of such foods will give the child less intellectual power and may even create mental imbalances. Spices such as turmeric, cumin and pepper help digestion, metabolism and brain nourishment, and should be introduced in small pinches if your child is not accustomed to them.
Some spices are anti-oxidants, and black pepper helps enhance utilization of oxygen in the brain.
The main idea is balance. Recommended fats include ghee and olive oil, and recommended sugar includes organic raw sugar, Sucanat, honey, rock sugar, and jaggary. Even if it's of good quality, it's important not to let the child eat too much fat or sugar. Just as an example, the average American consumes 125 lbs. of sugar a year, when just a hundred years ago the average was two pounds. Many children resist eating them, but if reminded, and if served in appetizing ways, they will do it.