Suppose a person weighed and exercised the same at 65 as he did at 25, his body would require 10 percent fewer calories than he did in his youth, partially because his fat-to-muscle ratio decreased as he grew older. Body fat requires less energy than protein-rich muscle.
A senior citizen also needs fewer calories because his basal metabolic rate has decreased. He burns fewer calories. The need for vitamins and other essential nutrients does not decline as much as an older person's caloric requirements. Consequently, the aged have little room in their diets for the empty-calorie foods, such as sugar and alcohol, that they may have enjoyed in their earlier years. For health's sake, they must make every calorie count.
** Healthy Diet