Being overweight is associated with health problems such as Type 2 diabetes. Obesity is associated with greater health problems than overweight. In 2006 Adams et al. estimated that the risk of death increases by 20 to 40 percent among overweight people. Some people think that being overweight is not as unhealthy as is commonly thought. A 2013 review of 97 Pubmed articles with a sample size of 2.88 million found that overweight is associated with significantly lower all-cause mortality (death) than 'normal' weight. Body fat contains energy that the body can use to heal when it is sick. 