The proteins that inactivate foreign bacteria and viruses to help prevent infections are called enzymes, hormones, collagen, antibodies. A vegan diet may be low in vitamin B12, iron, calcium, all the above. Why are nuts a heart-healthy food? They are rich in antioxidants, most nuts are good sources of monounsaturated fatty acids, they contain no cholesterol, all the above. Cooking an egg destroys its physiological property by denaturation, emulsification, esterification, detoxification.