Guys often wonder whether a dip in testosterone is at the root of their weight gain, says Dr. Stanford. "When men develop overweight and obesity, they tend to have a drop in testosterone that leads to a drop in energy and more retention of adipose tissue,” she says. The excess adipose tissue drives testosterone down. But taking testosterone isn’t usually the answer. “That’s not the underlying problem. Once we normalize the weight, the testosterone normalizes," she explains.
There appears to be a connection between estrogen and body weight regulation. With lower estrogen levels, lab animals tend to eat more and be less physically active. Levels that are too high or too low appear to lead to fat storage. And, lower estrogen levels may also slow down your metabolic rate (the speed at your body converts stored energy into working energy).
“To achieve and maintain a healthy weight as we age, it’s imperative that we incorporate a ‘movement portfolio’ into our daily lives,” said Kushner. He explained that your portfolio should include activities of daily living (like walking, using the stairs and house cleaning), active fitness activities (like bike riding and using the elliptical machine) and resistance-training exercises. Kushner also recommended trying to reduce the time you spend doing sedentary activities like watching TV. “These targeted action steps will boost metabolism and help maintain muscle mass,” he said.