No, it's not like that at all. Nothing is forbidden. On green days you have free foods you can eat (which are things such as potatoes, pasta, rice, and most fruits and vegetables). On original days your free foods would be lean meats, fish, shellfish, and most vegetables and fruits. You can eat as many of the free foods as you would like. Then you have what are called healthy extras for both plans. This would be where, using the original plan as an example, you could eat potatoes, pasta and such. You would only be allowed to eat a certain amount though. Likewise, healthy extras on the green plan would be lean meats, fish and such. They also have a plan called mix2max, where you can mix foods from both plans. Nothing is denied. My hubby and 20 month-old daughter eats everything I eat, and they both love it!
I have had experience with Weight Watchers (in the States), and I just never felt motivated enough with it. Of course, not every plan works for everyone. I love SW though!! My consultant, Rachel, is awesome! I, also, love all the men and women in my group. They rock! It has worked extremely well for me. Been going since November and have lost over a stone, and eat basically whatever I want. Even lost weight over the holidays!