Think You Can Simply Work off That Extra Donut? Not so fast…

Think it’s okay if you splurge on some sugary stuff just a bit because you will burn off the extra calories at the gym tonight?

Think again.

Exercise by itself isn’t always enough to help you lose those extra pounds you’ve got hanging around.

A new study published in the Cell Press journal Current Biology on January 28 helps explain why:

Your body adapts to higher activity levels, so you don’t necessarily burn extra calories even when you exercise more.

The researchers say the results suggest it’s time to rethink the effect of physical activity on daily energy expenditure.

They are also a reminder that you can’t outrun a bad diet.

Researcher Herman Pontzer of City University of New York said of the findings:

Exercise is really important for your health. That’s the first thing I mention to anyone asking about the implications of this work for exercise. There is tons of evidence that exercise is important for keeping our bodies and minds healthy, and this work does nothing to change that message. What our work adds is that we also need to focus on diet, particularly when it comes to managing our weight and preventing or reversing unhealthy weight gain.

People who start exercise programs to lose weight often see a decline in weight loss progress (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.

Pontzer says this really hit home for him when he was working among the Hadza, a population of traditional hunter-gatherers in northern Tanzania:

The Hadza are incredibly active, walking long distances each day and doing a lot of hard physical work as part of their everyday life. Despite these high activity levels, we found that they had similar daily energy expenditures to people living more sedentary, modernized lifestyles in the United States and Europe. That was a real surprise, and it got me thinking about the link between activity and energy expenditure.

To explore this question further in the new study, Pontzer and his colleagues measured the daily energy expenditure and activity levels of more than 300 men and women over the course of a week.

The data revealed a weak but measurable effect of physical activity on daily energy expenditure, but further analysis showed that this pattern only held among subjects on the lower half of the physical activity spectrum.

People with moderate activity levels had somewhat higher daily energy expenditures – about 200 calories higher -than the most sedentary people.

But people who fell above moderate activity levels saw no effect of their extra work in terms of energy expenditure.

Pontzer explained:

The most physically active people expended the same amount of calories each day as people who were only moderately active.

The bottom line?

Don’t assume that more physical activity always means you are expending more calories. There might be a “sweet spot” for physical activity – too little and you are unhealthy, but too much and your body makes big adjustments in order to adapt.