A condition that can be caused by deficiency, an excess of one or more ingredients, or by a toxin or poisonous element in the diet:

• An intake of food that is deficient in carbohydrates is usually deficient in proteins, too.
• An excess substances can cause obesity and dental caries which are the most common disorders in the U.S.
• Toxic effects are disorders that can arise from the presence of poisonous substances in the food which may be caused by industrial pesticides, fertilizers, pollutants, and other chemicals which can also contaminate food.