Nutrition refers to how the body takes in and utilizes food substances for its growth, repair and maintenance. It involves ingestion, digestion, absorption and assimilation. Nutrients are stored by the body in various forms and drawn upon when the food intake is not sufficient.
The key to good nutrition is balance, variety and moderation. To stay healthy, a body needs the right balance of carbohydrates, fats, and protein. It also needs vitamins, minerals and other substances from many different foods. While some foods are better than others, no single food or food group has all the necessary requirements, so eating a variety of different foods is essential.
Moderation means eating neither too much nor too little of any food or nutrient. Too much food can result in excess weight gain and even too much of certain nutrients, while eating too little can lead to numerous nutrient deficiencies