Overweight is a danger signal, particularly for those over 40. Studies of life insurance figures show that overweight people develop diabetes, heart disease, high blood pressure, and other life-shortening conditions earlier, and are apt to die younger, than people whose weight is normal. They are poor surgical risks and have less resistance to infection. Stout women are more likely to develop complications in pregnancy. _What Makes a Person Fat?_ Most people are fat simply because they eat too much. This does not necessarily mean that they stuff themselves with large quantities of food. It does mean that they take in more calories[2] than their bodies can use. This is often surprisingly easy to do, particularly for a person who has poor eating habits. Some people blame their overweight on metabolism (the rate at which their bodies use energy) and on the glands which regulate metabolism. In a very few cases, poorly functioning glands may _contribute_ to overweight. Even then, the overweight patient who is under a physician’s treatment for glandular disorders is able to lose weight when his food intake is regulated. What many people do not realize, however, is that the body’s energy requirements usually change after age 30 or 40. As a person gets older, metabolism slows down, and fewer calories are needed to maintain weight. The trouble is that eating habits usually stay exactly the same, while physical activity often decreases. Heredity is often claimed as a cause of overweight. Careful studies do not bear this out. Heredity does determine the type of body build a person has, but when people from overweight families change their eating habits it has been proved that they, too, can lose weight. Actually, most overweight people readily admit that their excess poundage comes from overeating. They say they just don’t seem to be able to stop. Knowing why a thing is hard to do sometimes makes it easier to change. _Why Do People Overeat?_ Many people eat more than they need for reasons that have little to do with hunger. Habit is one of them. Eating habits are set in patterns which have often been followed for years. Such patterns are not always easy to change, but with persistence and determination they can be altered. Some people develop the habit of overeating because good food and plenty of it is a family tradition. Some fall into the habit because of sociability. They eat more frequently and so consume greater amounts of food than they need. Some people consider food as a symbol of success or social standing, and so eating rich food and too much of it becomes a custom. Not infrequently the habit is established in pregnancy, in convalescence from some illness, or in other situations when extra food may be required.