Your result, the one DNA position behind it, and what the research says.
5/10 confidence.
Beta-2 adrenaline receptors sit on airway muscle, blood vessels and fat tissue, and adrenaline acts through them. In brown fat specifically, that signal is what triggers heat production: brown fat burns fuel to make warmth rather than to make usable energy, and it does so on adrenaline's instruction. This variant sits in a region that affects how much receptor gets built, so it tunes how loudly that signal is received. One study of older and younger adults in China also found this version more often in men who reached advanced ages. No other group has reported it since, so that part rests on much less than the receptor biology does.
Good to know: Brown fat makes heat on adrenaline's instruction, through this receptor. The receptor biology is solid; the longevity association is not. The same receptor is the target of common airway medicines.
Fun fact: Brown fat exists to burn fuel purely for warmth, which is why newborns have so much of it and why cold exposure activates it.
Discovery: Beta-2 receptor variants were characterized in the 1990s; the longevity association was reported later and remains debated.
The single variant behind this trait
Gene: ADRB2
Location: Chr 5:148,827,354
dbSNP rs1042718
Content updated September 2026.
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