Slimming World is a really good way to diet even if you're a big eater and it works too if you stick to it BUT if you fall off the band wagon you're still used to eating big so you can still eat large amounts of the 'wrong' foods and the weight piles back on. The stomach doesn't really get used to smaller portions as you can still pick at foods as they have 'free foods' which you can eat an unlimited amount of. If you are a big person you often just eat for eating sake and you can still do this with Slimming World, you can be slim yes but you will still be a big eater unless you really can stop eating when you feel 'satisfied'. That is the key... stop when you feel satisfied. A good diet to lose weight but it doesn't teach good habits!