When people burn a lot more calories than they eat for a few days, their muscles start responding more to a hormone called leptin, which helps them burn fat better—especially in the arms.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

31

Severe energy deficit upregulates leptin receptors, leptin signaling, and PTP1B in human skeletal muscle.

Cohort Study

Human

2017 Nov 1

The study put people on a very strict diet with lots of exercise for four days and found that their arm muscles started responding better to a fat-burning hormone called leptin, which helps burn more fat — exactly what the claim says.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Severe energy deficit upregulates leptin receptors, leptin signaling, and PTP1B in human skeletal muscle.

Score: 31

DOI: 10.1152/japplphysiol.00454.2017

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When the body is in extreme calorie deficit, the arms respond more strongly to fat-burning signals than the legs—possibly because the legs make more of a protein that blocks those signals.

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