Being obese (the clinical term used for fat-and there are grades-overweight, obese, and grossly obese) makes you more susceptible to diabetes, hypertension and heart disease, referred to as ‘the metabolic syndrome. It makes you more susceptible to heart disease and stroke. 29% of adults are classified as being obese, that is almost one in three people. Losing weight reverses these risk factors. So if our PM wants to set an example he should lose weight to something between 11 and 12 stones.