Of course, the requests for help are all a scam and the money wired by the victim, often in very large amounts, is now in the hands of the criminal. Bank staff are aware of these kinds of scams and are trained to pay attention if a customer makes an unusual transaction -- for example, withdrawing more money than usual.
How does the scam work?
The claims for weight loss are nothing short of outlandish and there is real science that suggests the whole thing is a hoax. Studies that claim to have found weight loss were carried out on animals. Studies involving humans are for the most part badly designed.