I am kind of surprised by this. I was aware that eating disorders were much more common among gay men than among straight men, but I didn't know lesbian and bisexual women faced heightened levels of eating disorders as well.
I generally assumed that the reason more gay men starved themselves and threw up was because of the Male Gaze and judgmental gays who can dominate certain gay spaces. But low self-esteem and social isolation should also be thrown up there, since if it was just the Male Gaze lesbians would at least have reduced rates of eating disorders.
Lead researcher S. Bryn Austin and her colleagues found that lesbian, bisexual, and mostly heterosexual girls were about twice as likely as heterosexual ones to report binge-eating. Bisexual and mostly heterosexual girls (though apparently not lesbians) were also more likely to purge. Homosexual boys were seven times more likely to binge and 12 times more likely to purge than straight boys, with bisexual and mostly heterosexual boys facing a lesser but still elevated risk.