An optimal diet supplies nutrients in adequate amounts for tissue maintenance, repair, and growth without excess energy intake. Dietary intake for active people must account for energy demands of the particular chosen sport and its training demands. The physically active person person must obtain sufficient energy and macronutrients to replenish liver and muscle glycogen, provide amino acid building blocks for tissue growth and repair, and maintain a desirable body weight. Lipid intake must also provide essential fatty acids and fat-soluble vitamins.
The large number of teenagers and adults, including competitive athletes, who exercise regularly to keep fit do not require additional nutrients beyond those obtained through the regular intake of a nutritionally well-balanced diet.
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