Many food colorings and flavorings negatively affect the immune system and may cause allergic reactions in some individuals. Lactose produces clinical symptoms such as diarrhea and gas in about one-third of the population. Excess sodium is associated with water retention and high blood pressure. Some fats such as essential oils are necessary and will be found in good protein, but more is not always better, and saturated fat is not nutritionally to one's advantage. Dietary cholesterol has been strongly linked to heart disease.
Iron benefits the body by carrying oxygen to the cells, necessary for the production of energy.
Protein low in fiber encourages diarrhea while a protein naturally bound to fiber promotes healthy bowel function. Acidic foods are characterized by a bitter taste, which is commonly camouflaged by the manufacturer with artificial flavoring. This disagreeable taste tends to lead to poor user compliance. Over time, osteoporosis, arthritic decay, and muscle stiffness will be noted. Additionally, acidic foods pose difficulty to the kidneys.