The diet and exercise industry is massive, but there's so much snakeoil out there. The simple formula of calories in and what you burn is pretty much it, but getting fit brings other benefits. Some people just find it really hard to do what they need to. Surgery has to be a last resort.
Stay well!
I agree about surgery and at least where I live, unless you are medically qualified (or I guess a celebrity) they won't just let you have it because you feel like it. Diet is key, a lot of people don't want to admit that. I know people that exercise a lot but they never end up looking or feeling fit because their diet is not good.