Obesity is estimated to be responsible for more than 30,000 deaths each year, reducing lifespan by an average of nine years. The links between obesity, diabetes and cardiovascular disease are well documented, but overweight and obesity also causes 6% of cancers in the UK. These figures have resulted in warnings that obesity is the new smoking when it comes to risks to health and longevity. So the problem is clear. The challenge is to put into action what works.