Lessons in how to get fit and lose weight

THE diabetes prevention courses last at least nine months and consist of at least 13 sessions.

Some are made up of exercise classes while others teach patients to cut levels of saturated fat and lose weight.

They are run by nutritionists and fitness advisers who encourage patients to cut down on treats including cakes, cheese and red meat – but increase their intake of fruit, veg and wholegrains. They are given short-term goals – such as losing a pound a week – in the hope of eventually reaching a healthy weight.

Patients are also taught strategies to help them resist cravings for sugary foods, to prevent them relapsing and gaining weight again.

Some sessions involve motivational interviews with lifestyle coaches which help reinforce reasons for wanting to become healthier.