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Having dedicated their professional lives to raising awareness about obesity, father and son surgeon team, Drs Robert and Garth Davis, are back with a new series helping severely overweight patients.

Not for the faint hearted, each episode tells the jaw dropping stories of the people who turn to the Houston Methodist Weight Management Centre in a last resort to change, and in some case save, their lives.

Since series one, Alan has lost over 500lbs and is back for a double mastectomy in his quest to walk for the first time in years. 22 year old Vanessa is hoping to revive her sex life by removing her sagging skin, whilst Kim a school principal is getting surgery to remove her "bat wings".

Tiffany, who weighs 650lbs and featured in the first series returns as the doctors struggle to convince her to enter an extreme weight loss facility before it's too late. Kathy tries to rid herself of the excess skin caused by massive weight gain after her daughters’ suicide, and Marshall, one of the doctors' biggest patients from series one, visits the centre 11 months after his surgery to show just how much progress can be made in a year.

Related links:

- For advice on how to take care of your own body, see the Discovery Home & Health guide to Your Body.