These rises are due, of course, to the continued failure of the NHS and the medical profession et al to give the correct information and advice about the causes of obesity and the best ways to reduce it. Dieting, calorie reduction and low-fat eating do not reduce or prevent obesity and they are often very harmful.
It is easy and completely safe for any obese person to lose a considerable amount of excess weight by reducing the fluid retention that is a feature of all obesity. To reduce excess weight therefore, cut down on salt/sodium and salty foods. This reduces the sodium and water retention by excretion of excess salt and water in the urine. Before anyone, especially young people, embarks on bariatric surgery with all the risks and expense involved in surgery, they should be advised to cut down on sodium intake as a completely risk-free means of weight loss.