Health Claims

In healthy adult women, how many calories they burn in a day is mostly explained by how much muscle they have and how much energy they use at rest—physical activity and thyroid hormones add little to...

In healthy adult women, being more physically active does not lead to a higher resting metabolism once you account for muscle mass and thyroid hormone levels—meaning activity doesn’t directly boost...

In healthy adult women, higher levels of the active thyroid hormone T3 are linked to a slightly higher resting metabolism, but changes in thyroid hormones do not explain why more active women have...

In healthy adult women, those who are more physically active tend to have lower levels of thyroid hormones in their blood, but this does not mean activity causes lower hormone levels—it simply shows...

Unlike some theories suggesting a limit to how many calories you can burn, older adults who move more continue to burn more calories without hitting a ceiling, even at high activity levels.

In older adults, how much you move accounts for only a small part of how many calories you burn each day—your muscle mass and other factors matter much more.

Whether physical activity leads to higher calorie burn in older adults depends on whether they are gaining, maintaining, or losing weight—activity increases calorie burn when weight is stable or...

When older adults are losing weight, increasing physical activity does not lead to burning more calories overall—energy expenditure stays roughly the same, even with more movement.

In older adults, being more physically active is linked to burning more calories each day, with those who move the most burning about 340 more calories daily than those who move the least, as long as...