There's no magic cure and the individual has to want to get fit and healthy again.
Agreed. Your mate is likely to encounter problems, which is one of the drawbacks of not going through a comprehensive program with the NHS. Your diet has to change completely, because you can no longer eat or drink the volumes you used to, or absorb the same amount of nutrients from your food. You're also on vitamin and mineral supplements for life.
Perversely, if he had been put on a weight management program with the drugs, his food drive would diminish as would the urge to have "Cottage pie, full English breakfast and a pint of Lager". The drugs also slow digestion, so if you do overeat, you'll most likely find it coming out again from one end or the other. It's the combination of the loss of appetite and food digestion that helps with weight loss and the retraining of the body - see the set-point above.
Isn't though is it. I'd rather be a thick **** than a THICK ****.
Small brained and small portions sweetheart. You keep hiding behind excuses. Like a true Scouser, it's not your fault.
Congratulations! You've mastered the art of the sophisticated insult! I guess some people are just born with a thicker skull, and it shows.