Portion sizes are definitely a big deal. I battled with weight for a long time because I never really changed portion sizes, just how many meals I ate (would go from 180 to 250 pounds back and forth because of crash dieting and then crash eating). Only recently did I actually change the portion sizes of my meals, and have already lost around 30 pounds in 4 months. Not a super fast diet by any means, but a lot easier to keep the weight off because once you get used to the portion sizes, you don't really have a way to go back up in weight unless you suddenly start eating 4-5 meals a day.
Portion sizes are definitely a big deal. I battled with weight for a long time because I never really changed portion sizes, just how many meals I ate (would go from 180 to 250 pounds back and forth because of crash dieting and then crash eating). Only recently did I actually change the portion sizes of my meals, and have already lost around 30 pounds in 4 months. Not a super fast diet by any means, but a lot easier to keep the weight off because once you get used to the portion sizes, you don't really have a way to go back up in weight unless you suddenly start eating 4-5 meals a day.