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In addition, research suggests more protein, complex carbs (not processed or refined) and omega-3 fatty acids.
Adapted from WebMD:
1) Eat a high-protein diet, including beans, nuts, seeds, plant-based protein powders. Add protein foods in the morning and for after-school snacks, to improve concentration and possibly increase the time ADHD medications work.
2) Eat fewer simple carbohydrates, such as candy, corn syrup, honey, sugar, products made from white flour, white rice, and potatoes without the skins.
Eat more complex carbohydrates, such as vegetables and some fruits (including oranges, tangerines, pears, grapefruit, apples, and kiwi). Eating complex carbs at night may aid sleep.
3) Eat more omega-3 fatty acids, such as those found in tuna, salmon, other cold-water white fish, walnuts, Brazil nuts, and hemp or chia seeds. Omega-3 fatty acids are also available in supplement form.