Stereotypes may be generalisations but are usually based on truth. "After scrutinizing a health survey of more than 67,000 Massachusetts residents between the ages of 18 and 64, the researchers found that 14 percent of gay men were obese versus 21 percent of straight men. The opposite was true of gay women: 26 percent were found to be obese, as compared with 17 percent of the straight women. "  http://www.nbcnews.com/id/37557883/ns/health-behavior/t/gay-guys-really-are-thinner-study-says/#.Wd5FLlvWzIU And a British study:  "Over half of gay and bisexual men have a normal body mass index (BMI) compared  to under a third of men in general. Just 44 per cent of gay and bisexual men are  overweight or obese compared to 70 per cent of men in general "  Same study also shows obesity levels: gay/bisexual men 14%, straight men 28%. Damn.  https://www.stonewall.org.uk/sites/default/files/Gay_and_Bisexual_Men_s_Health_Survey__2013_.pdf