In England there has been a sharp increase in the prevalence of overweight and obesity in adults. In 1993 58% of men and 49% of women were classified as overweight or obese compared with 65% and 58% respectively in 2011; 24% of men and 26% of women were classed as obese in 2011. Obesity increases the risk of diabetes, hypertension, coronary heart disease, deep vein thrombosis and pulmonary embolism. It is also associated with an increased risk of certain cancers. Lifestyle weight management programmes should be multicomponent, developed by a multidisciplinary team, and delivered by individuals who have undergone appropriate training. They should focus on long-term weight loss and prevention of weight regain and continue for a minimum of three months.