According to the researchers, it's time to stop assuming that more physical activity always means more calories.

There might be a 'sweet spot' for physical activity - too little makes unhealthy but too much makes big adjustments in order to adapt.

People who start exercise programmes to lose weight often see a decline in weight loss - or even a reversal - after a few months.

Large comparative studies have also shown that people with very active lifestyles have similar daily energy expenditure to people in more sedentary populations.

The results suggest, it's time to rethink the effect of physical activity on daily energy expenditure.

They are also a reminder of the importance of diet and exercise in supporting weight loss goals, the researchers said.

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