From Eight Reasons You're Still Fat by Liz Ward at Men's Health:
Exercise alone won't make you thin. A recent study of military personnel who increased their exercise during a 3-year period found that they gained weight despite their extra efforts. Why? Food, most likely. They simply ate more than they burned off.
Solution: [T]rust me on this: controlling portion size is absolutely essential to weight loss. And the best way to control portion size is to limit how often you eat out. According to the Tufts University Health & Nutrition Letter, a single restaurant meal often could feed an entire family. A pasta dish at an Italian restaurant might include eight 1-cup servings. A rib dish might have a pound of meat – more than five servings. A side of fries might include 70 of the little devils, which is seven servings. And a nut-filled cinnamon bun in a mall food court could total 1,100 calories – more than half the calorie intake on a typical weight-loss diet.
