The idea that exercise is more important than diet in the fight against obesity has been contradicted by new research. A team of scientists from the US, Tanzania and the UK, measured energy expenditure in 30 Hadza men and women aged between 18 and 75. They found physical activity levels were much higher in the Hadza men and women, but when corrected for size and weight, their metabolic rate was no different to that of Westerners.
Dr. Herman Pontzer of the department of anthropology at Hunter College, New York, said everyone had assumed that hunter gatherers would burn hundreds more calories a day than adults in the US and Europe. The data came as a surprise, he said, highlighting the complexity of energy expenditure.
Being active is really important to your health but it won't keep you thin - we need to eat less to do that.