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The relationship between basal metabolism and weight is complicated, however, Pontzer says.

Exercise remains central to our basal metabolism, even though it is no longer a core part of life for some human populations.

Sloping lines represent regressions of oxygen consumption on chamber air temperature, and horizontal lines, basal metabolism.

This measurement represents the basal metabolism of a man at complete rest, when his oxidative activities are at their lowest ebb.

Intermittent fasting and other timed eating regimens ultimately reduce caloric intake, raising similar concerns of slowing basal metabolism.