People think I eat really cleanly, because I've been mostly vegan for years, and I rarely drink alcohol. Also most people know I walk a lot, partly from not having a car, but also just to get out and moving.
So they tend to assume a "clean" diet and no alcohol will do the trick. It's funny really, because despite being vegan I eat quite a lot of junk food. And I bake, which when you're on your own is a big lot of food each time. Folks seem to assume vegan cake is healthier than normal cake. Uh, no!
Mind you folks I really know tend to know I have an ED, though they may know more or less about it depending on what they've actually asked me. And male friends never notice anything, which is happily convenient! I hate to stereotype, but tis the truth. Apart from the one guy who asked me if I had a wasting disease because my fingers were really skinny, apparently. That was kind of weird, though he's a good man in general.