In the aging process, you will gradually lose muscle, especially when you are not physically active. Because of muscle loss, your body slows down burning calories, and you will increase body weight.
Some studies show that genes may also cause overweight and excess abdominal fat. But for most male, unhealthy lifestyles may be the main reason causing overweight. Excessive alcohol can increase belly fat. Alcohol drinking should be in moderation, as this will help you avoid gaining extra calories.
Healthy lifestyles, such as healthy eating habits and regular physical activity, can often help to maintain a healthy body weight.