brown fat
noun
: a mammalian heat-producing tissue occurring especially in human fetuses and newborn infants and in hibernating animals
called also brown adipose tissue
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One 2014 study published in the journal Diabetes found that the resting metabolic rate in healthy people with detectable levels of brown fat increased by 14% after cold exposure, though most estimates hover around five to 11%, according to Dada.
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Caroline Tien, SELF, 15 Jan. 2026
Obesity is also correlated with lower levels of brown fat and higher levels of white fat, Spiegelman says, but more research is needed to fully understand why.
—Jackie Flynn Mogensen, Scientific American, 15 Jan. 2026
It's even being studied as a promising obesity treatment, where it was shown to boost brown fat burn and encourage white fat to turn brown in mice.
—New Atlas, 16 Nov. 2025
In order to generate heat, the brown fat cells need to draw on energy reserves stored in other fat cells.
—Diana Hubbell, Popular Science, 10 Sep. 2025
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Caroline Tien, SELF, 15 Jan. 2026
Obesity is also correlated with lower levels of brown fat and higher levels of white fat, Spiegelman says, but more research is needed to fully understand why.
—Jackie Flynn Mogensen, Scientific American, 15 Jan. 2026
It's even being studied as a promising obesity treatment, where it was shown to boost brown fat burn and encourage white fat to turn brown in mice.
—New Atlas, 16 Nov. 2025
In order to generate heat, the brown fat cells need to draw on energy reserves stored in other fat cells.
—Diana Hubbell, Popular Science, 10 Sep. 2025
See All Example Sentences for brown fat
Cite this Entry
“Brown fat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brown%20fat. Accessed 29 Jan. 2026.
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