Role of nutrition during long-term spaceflight

The authors discuss changes in macro- and micro-nutrients which occur in weightlessness and consider factors which help maintain appropriate nutrition during extended space flight. Basic energy requirements and metabolism are reviewed. The discussion of handling of foodstuffs includes protein, fats, carbohydrates, vitamins, folic acid, iron, and selenium. The discussion of fluids and minerals includes fluid intake, sodium, potassium, and calcium. Changes in gastrointestinal function are examined.