In what tissue is brown adipose tissue primarily found?

Brown adipose tissue is primarily found in infants. This type of adipose tissue plays a critical role in thermoregulation, especially in newborns who are adapting to life outside the womb. Infants have a higher proportion of brown fat compared to adults, which is crucial for generating heat and maintaining body temperature since they are unable to shiver. While adults also have some brown adipose tissue, the quantity and distribution are significantly reduced compared to that in infants. Thus, the presence of brown adipose tissue in infants is an essential adaptation for their survival and metabolic needs during the early stages of life.