A pound of fat, on the other hand, takes up four times the space of muscular tissue, lending credence to the idea that you may appear and feel thinner while maintaining your weight. Two people might weigh the same amount yet appear quite different. Person 1 could have a high amount of fat, whereas Person 2 might have a high percentage of muscle. Muscle is denser than fat, so even if both people weigh the same amount, Person 2 will seem thicker. The reason for this is simple: fat is stored in body cells, whereas muscle is made up of fibers that connect cells together. So even if you have the same number of cells, more muscle means you appear thicker because there's more room inside your body for them. Fat tends to accumulate around the stomach, buttocks, and thighs. People who are lean but muscular have an advantage here over those with less muscle mass or more fat accumulation- they look thinner because there's less volume in their bodies than someone with more fat content. However, even among individuals of similar build, how anyone appears is going to vary depending on such factors as bone size and structure, muscle tone, and skin fold characteristics. For example, two people who weigh the same amount of may have different amounts of fat storage in their bodies, which would explain why one person looks thin while the other doesn't. In conclusion, a pound of fat stores about three times more energy than a pound of muscle.