Hi Sticker I've tried all 3, couldn't stick to the 5:2, I found that too hard, I used to be a Cambridge diet consultant, but then came to realise that the weight just piled back on once you stopped, and I feel it messed with my metabolism, and made me gain even more in the long run, but I do find the slimming world works for me, at last a diet I can stay on long term, and I am losing an average of 2 pounds a week, that's a lot of weight in one year! It's the only diet that seems to work for me in the long term, but I do have a medical condition, I had thyroid cancer nearly 30 years ago now, so don't have a Thyroid and am permanently on meds, I had all but given up trying to lose weight, but at last I think I will finally be able to rid myself of all the weight gained during my treatment