Nutrition and nutritional requirements for the older adult.

Establishing reliable nutrient requirements for individuals over the age of 65 years is a difficult task. Research on nutrient requirements in the aged is sparse and often contradictory. However, there are important clues in the literature suggesting that requirements for certain nutrients are altered with age and that preventable nutrient deficiencies exist. Energy expenditure and caloric intake typically decline with age. Unless nutrient density of the diet improves, a parallel decline in vitamin and mineral intake is inevitable. Deficiencies or suboptimal intakes of water-soluble vitamins, vitamin D, calcium, zinc, copper, chromium, and water are reported in groups of older adults. Marginal nutrient deficiencies in this population may easily go undetected and contribute to morbidity.