Being overweight doesn't just affect your self-esteem; it affects your health. Research shows people who are overweight are more likely to develop heart disease, stroke, diabetes, gallstones, osteoarthritis, sleep apnea, and even cancer than healthy-weight adults. When dieting and exercising to shed those excess pounds, however, you should consider how it will affect your muscle mass. If you aren't careful, you may lose both body fat and muscle mass during your weight loss journey. Losing weight requires equal parts dieting and exercising, both of which lower the number of glycogen reserves in your body. As a result, your body...