1) I am unsure completely as to whether he needs to take supplements or medication, but as he has only had a partial removal of the stomach, all nurtirients that the stomach absorbs can still be absorbed, whereas with total removal, certain injections are required.
2) The article I read had been published in mid-2014 and he had lost the 12st in 13mths, I am unsure whether he has lost any more.
3) I am unsure about what he's lost in the time he has would be achievable without surgery in the same timescale, I do agree that surgery isn't always the option
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