You can stop doing gay things, but you can't actively change your sexuality. It may be fluid and change, but you can't think 'hmm, I'm gonna be straight today'. You can decide, however, to eat sensibly and exercise.
In the end, its about the individual making their own decisions.. let them be and stop making them feel like **** about themselves. They are probably already thinking it
Let people be proud of their bodies, it's none of your own damn business. When someone insults you for being gay you get all pissed off but if we're talking about fat people it's ok to insult them?
Nuh, just let people live. If they want to change and feel like they need to do so, they will do it by themselves or with some help. There's no need for society to be all up in their business, even more than we already are.
Society has this obsession with the perfect body. It takes a lot of courage for "fat" people even at healthy weights to say they are content with their bodies.
There are people out there who are a little thick though not necessarily fat who get punished for having a little weight on them. Just as there are people who get told to eat a hamburger because they are too skinny apparently. Both are a bit unfair. Everyone is annoyingly obsessed with perfection.
If someone at an unhealthy weight (or headed there) then hopefully there are people in said person's life who know the difference between constructive criticism and bringing someone down.
There are cases where people are clearly living a lifestyle detrimental to their health, and then I'm genuinely concerned. This isn't like sexuality or anything, in most cases it's to do with lifestyle. Society needs to crack down on obesity (and anorexia), and promote a more healthy weight (less like it is right now, more Meghan/Demi, y'all can call them 'fat' or whatever but they're pretty healthy and a good size to be at).
In children yes.
But in the case of adults who have chosen that lifestyle it isn't your place to tell them to change unless you're their doctor and they have actual health problems. Mind your own business basically.