Well, I can chime in on this since it's something that I took to heart a few years back. There's no specific subject yet, so I'll just drop in an anecdote and some token advice.
Losing weight is really hard. I've known a lot of people who tried to lose weight and either lost very little or didn't keep it off for long. Most people don't make it out of the "I need to lose some weight" phase I guess.
Anyway, I was able to lose about 150 pounds over the course of about 3 years and have so far kept it off for about 4 more years.
The secret? There was no secret.
I think that's where a very large number of people mess up with dieting. I don't think I could have ever followed a specific diet that cut out any specific foods I like, and I'd guess that a lot of people are the same way. So, instead of doing that, I literally only cut back on how much I ate. I still ate the foods I wanted. I just ate less of them. That's it. I set a daily caloric target of about 1500-1800 calories, and ate what I wanted until I got to that point.
More specifically, I usually ate a light breakfast and lunch and ate about whatever I wanted for dinner. By keeping about 1,000 calories open for that meal I was able to eat pizza or just about anything reasonable. I tried to avoid snacking, but I did buy fruit and light snacks like yogurt for that purpose.
A few other things I learned from experience while dieting:
1. Don't starve yourself. I tried eating less calories (1200 or so) and all it did was make me feel terrible. It didn't make me lose weight any faster.
2. Don't expect to do serious strength training while dieting. It doesn't work and it will also make you feel terrible. Exercise is good, but pushing yourself to try and gain strength while dieting doesn't work.
3. You really just have to get out of the mindset that you're dieting. If you're constantly anguishing over the fact that you can't eat what you want, you won't stick to it. I just got into the mindset of eating a light breakfast and lunch and mostly forgot I was cutting back.
Well, all of that worked for me anyway. It probably won't work for everyone, or maybe even most people, but it did work for me.
Okay, that rambling aside, I'm currently planning on trying to get back into exercising. I live a very sedentary lifestyle because I'm a programmer who doesn't like physical labor, and I really could use some activity in my life. I hear it's also good for stress relief, which is something I desperately need. I guess mental health counts as on topic for health and wellness.