Any food that contains calories and, therefore, can generate hormonal responses. Protein, carbohydrate, and fat are macronutrients.
The longest period of life that an animal can expect to reach.
The hormone made in the pineal gland that controls circadian rhythms. It is also a powerful antioxidant for hydroxyl free radicals.
Vitamins and minerals that have no caloric value and little direct impact on hormonal response.
The amount of time required for the death rate to double after reaching adulthood.