Changes in Metabolism
The most significant result of the loss of lean body mass may be the decrease in basal energy metabolism. Metabolic rate declines proportionately with the decline in total protein tissue. At the same time, total body fat typically increases with age. This often can be explained by lower metabolic rate in addition to too many calories. As people age, fat tends to concentrate in the trunk and as fat deposits around the vital organs. However, in more advanced years, weight often declines. To avoid gaining weight, calorie intake should be reduced and amount of physical activity can be increased. The goal is energy balance.