Calories~ A unit of measurment to determine how much energy something has
Nutrients~ A substance that provides nourishment essential for growth and the maintenance of life.
Nutrition~ The process of providing or obtaining the food necessary for health and growth.
Appetite~ A natural desire to satisfy a bodily need, especially for food.
Hunger~A feeling of discomfort or weakness caused by lack of food, coupled with the desire to eat.
Nutrient deficiency~Occurs when the body doesn't absorb or get from food the necessary amount of a nutrient.