Caloric deficit, that's the only method that I've seen work. 1200 a day, no more no less- well, have cheat days wink allow a few days to add another 500 calories to the day. But make sure that the bulk of your 1200 is healthy foods like veggies, fruits, nuts, complex carbs, dairy (optional), and lean meats. But definitely the veggies, since you get more volume for less calories and more nutrients.
Something I do, which works for me as well, is I skip dinner. I make sure my lunch is my heaviest meal, so I'm not hungry at night. Has never failed me. But some people will say 6 small meals, that's fine too, but it doesn't work for me.