?And not just when you’re trying to fit into pants. Excess buttocks fat, especially in women, can reduce the effectiveness of vaccines, painkillers, contraceptives and anti-nausea drugs that are typically injected there.

Australian doctor Victoria O. Chan made a study of 50 patients, half of them men and half women, ranging in age from 21 to 87. All received medicine by intramuscular buttock injection and all were scheduled for CT scans.

The researchers injected the medicine along with a milliliter of air and then did a CT scan to establish the location of the air bubble and the medicine in order to spot whether the medicine landed in the muscle, where it could be absorbed, or whether it remained lodged in fat.
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