It may be. Everyone's metabolism begins to slow during the early to mid-30s. This change occurs gradually, so it may take a while for the impact of eating habits to affect weight. Many women gain about five to eight pounds during the menopausal transition and notice a thickening around the waist. It tends to level out after menopause. It is important to make a sensible, nutritious diet and healthy behaviors, such as getting enough exercise, goals for life. There is some evidence that eating a diet that includes lean protein, is low in fat and low in carbohydrates may help. The only reliable way to lose weight is to reduce caloric intake and increase caloric expenditure by exercising daily.