I've got 3 stone to lose and despite various attempts I've failed to lose it. I found the NHS has had a decent success rate through prescribing a soup and shake diet. I think the shakes they use are Optifast which you can buy online. I'm thinking of getting some but as with most of these things, it's not very cheap so keen to see if anyone on here has experience of using Optifast and what they thought of it? Thanks!