Nutrition is the science that deals with the study of food and how it affects the body's health and well-being. It involves the process of consuming, digesting, and using nutrients from food to maintain good health and prevent diseases.

Nutrients are substances found in food that provide energy, promote growth and repair of body tissues, and regulate body processes. There are six main categories of nutrients, which include carbohydrates, proteins, fats, vitamins, minerals, and water.

Carbohydrates provide the body with energy, while proteins are needed for growth, repair, and maintenance of body tissues. Fats also provide energy and help in the absorption of certain vitamins. Vitamins and minerals are essential for proper functioning of the body, and water is needed for hydration and various body processes.

A balanced diet that includes a variety of foods from each of these categories is crucial for good health. Poor nutrition can lead to various health problems, such as obesity, malnutrition, diabetes, heart disease, and other chronic diseases. Therefore, it is important to pay attention to one's dietary habits and make healthy food choices to maintain optimal health.