People With Obesity Are Unhealthy, Thin People are Healthy It is true that obesity is associated with an increased risk of several chronic diseases. This includes type 2 diabetes, heart disease, increased risk of some cancers, and others (18, 19, 20). However, there are still plenty of people with obesity who are metabolically healthy, and plenty of thin people who have these same chronic diseases (21). It seems to matter where the fat builds up. If you have a lot of fat in the abdominal area, around the organs, then this type of fat is much more strongly associated with metabolic disease (22). The fat that builds up under the skin, the subcutaneous fat, is more of a cosmetic problem.