Samantha Lamb is on a race against time. Her husband Andy is dying from kidney failure and urgently needs a transplant, but was unable to find a donor, until Sam was tested. It was a million to one chance, but his wife of four years turned out to be a perfect match. There’s just one big problem: weighing over 120 kilos, Sam is clinically obese. Doctors fear that unless she loses at least 22 kilos, the operation is too great a risk and could kill her. Andy’s condition is deteriorating by the day. He’s been here before as he had to have a kidney transplant 12 years ago when his own kidneys failed. The transplanted kidney has stopped working and he’s being kept alive by dialysis – but that’s now weakening his heart. Sam has the best incentive in the world to lose weight, but can she do it? Diet Or My Husband Dies follows the family’s progress as Sam embarks on a crash course in weight loss. She spends two hours a day at a local gym and has swapped burgers and chips for brown rice and salad. With Andy’s condition continuing to worsen, will Sam succeed in time to save him?