Nutrition refers to the study of how food affects the body and its functions. Proper nutrition is essential for overall health and wellness, and can help prevent chronic diseases such as heart disease, diabetes, and obesity. Nutrition involves the consumption of a balanced diet that includes all of the necessary nutrients, such as carbohydrates, proteins, fats, vitamins, and minerals. Nutritional deficiencies can lead to a variety of health problems, including fatigue, weakened immune system, and impaired cognitive function.