What is the trend in body fat percentage as one ages?

As individuals age, there is a general tendency for body fat percentage to increase. This change is attributed to several physiological factors associated with aging, including hormonal shifts, decreases in metabolic rate, and changes in body composition.

As people age, their muscle mass typically declines, a condition known as sarcopenia. Since muscle tissue is more metabolically active than fat tissue, a decrease in muscle mass can lead to a slower metabolism and consequently a higher proportion of body fat. Additionally, changes in hormone levels, such as decreases in testosterone for men and estrogen for women, can also prompt fat accumulation, particularly in the abdominal area.

Furthermore, lifestyle factors that often accompany aging, such as decreased physical activity and dietary changes, may contribute to an increase in body fat percentage. Collectively, these influences lead to a notable trend of rising body fat as individuals grow older.