Hunter-gatherers offer clue to obesity puzzle

US researchers measured the calorie expenditure of 30 adults from the Hadza tribe in Tanzania who walk long distances to forage for wild plant food and game.

They found that the women in the tribe had a similar daily energy expenditure to Western women and that Hadza men burned the same amount of calories per day as Western men.

“Measurements of total daily energy expenditure among Hadza hunter-gatherers challenge the view that Western lifestyles result in abnormally low energy expenditure, and that decreased energy expenditure is a