While the negative health outcomes associated with obesity are accepted within the medical community, the health implications of the overweight category are more controversial. The generally accepted view is that being overweight causes similar health problems to obesity, but to a lesser degree. A 2016 review estimated that the risk of death increases by seven percent among overweight people with a BMI of 25 to and 20 percent among overweight people with a BMI of to 30.  The Framingham heart study found that being overweight at age 40 reduced life expectancy by three years.  Being overweight also increases the risk of oligospermia and azoospermia in men.