Nutrition involves getting six essential nutrients through a variety of foods in moderation. These nutrients provide energy, build and repair the body, regulate processes, improve immunity, aid weight management, and reduce stress. Nutrition basics include macronutrients like carbohydrates, proteins, and fats which provide calories or energy, and micronutrients like vitamins and minerals which enable chemical processes but do not provide energy. Staying hydrated with water is also important, as water regulates temperature, removes waste, and transports nutrients throughout the body.