I'm thinking of joining SW and wondered if anyone can explain to me how it works? I've done WW in the past and wondered if I should try something different. I read a bit on the wesbite and am worried about portion control....I tend to overeat and read that you can eat as much pasta, rice etc as you like. Is that true? And what is IMAGE? Thanks in advance - don't want to sign up and then drop out straight away if I can help it so any help gratefully received 