Explain the Nutritional Changes and Requirement - Geriatric Nutrition?

Nutrition is affected in two way -due to the changes in physiological function with  aging having effect on absorption, retention and utilization of nutrients and on the  other hand the extent to which a particular nutrient or diet pattern affects the senescence  /aging. To a certain extent, optimal nutrient intake, food and selection can help in a better life of an aged person in addition to his/her genetic constitution. By 1970, it was suggested that with age the requirements for macro-and micronutrients change. The RDA have been given for 51+ age group by National Research Council (1989, US).