Wikipedia: Brown adipose tissue

Physiology primer on thermogenic adipose, cold activation, and human imaging literature—supports mechanistic reading of cold-exposure sources.

Mechanism layer

Helpful when reconciling BAT FDG-PET findings with everyday cold-shower or plunge practice.

Human translation

Magnitude and durability of metabolic effects vary widely; defer to cold-adaptation trials linked from cold-exposure protocols for population-relevant data.

Outcomes

metabolic-rate
Tertiary physiology summary; cold-induced EE changes require primary human trials

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