They will also be encouraged to prescribe more gentle forms of exercise such as yoga for less active pensioners.

BBC: Exercise on prescription

Its website says the surgery is appropriate for adults who have failed with more conservative alternatives, such as diet and exercise.

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It is impossible, for example, to demonstrate a link between health-care delivery and life expectancy, because factors such as diet, exercise and smoking are much more important than the number of costly gadgets in hospitals.

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After the recession left millions jobless, some economists said they hoped that in lieu of work, Americans would spend more time on productive activities, such as volunteering or exercise, said Princeton economist Alan Krueger.

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An earlier study conducted by Dr. Mujica-Parodi and other researchers found that the activity in the amygdala region of the brain, which processes emotions such as fear, was more active in people exposed to stress sweat rather than exercise sweat.

WSJ: Why We Sweat When We're Stressed

The results showed that lifestyle changes, such as a low calorie diet, exercise and a little help from a coach, were more effective in reducing the risk of developing diabetes than drugs.

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And Mr Burrell - who denies stealing 310 items from the princess - was also accused, before the jury, of destroying some of her more "intimate apparel" such as underwear, a swimsuit, stockings, tights and exercise clothing.

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