Hi all, on SW and doing g well, but I'm really struggling with the difference between sugar free and fat free on slimming world and calculating syn values (mainly with jelly and Yoghurt). I know as a rule of thumb, 20 calories is about 1 syn... but if something is fat free but still has calories... would it be Free... such as yoghurt? And vice versa, if its sugar free but has a fat count... would that be Free? I hope this doesn't sound like a stupid question, but it's really confusing me! Is it something to do with the way it is made? Processed? Any help would be great, Thanks so much!!