It was always amazing to me how people perceived weight loss who had never had an issue. Even the medical community basically doesn't get it that individual metabolism is huge. For me, sleep is huge. I was eating 2000 cal/day while strength training and running for 10+ hours/week while watching my wife eat 2500/day and exercise less than half that. She would lose, I would not.
Of course whining about metabolism doesn't help with weight loss.
Not to mention the fact that much like an addict, thinking about food or avoiding food still takes up a large part of my mental energy every day.
I can't even begin to express how angry I get when someone asks me why I watch what I eat because I'm "so skinny", in their words. I'm this way because I've worked incredibly hard to get here and continue to work to maintain it. It doesn't come easily.