How does cold stress impact brown adipose tissue (BAT) in newborns?

• A. It decreases the function of BAT
• B. It leads to increased reliance on BAT
• C. It causes infants to gain weight
• D. It enhances the function of BAT

Answer: (B)

The impact of cold stress on brown adipose tissue (BAT) in newborns is significant because newborns rely heavily on BAT for thermogenesis, which is the process of heat production. When exposed to cold stress, the body requires additional mechanisms to maintain temperature, particularly in the vulnerable neonatal period.

In response to cold exposure, the autonomic nervous system stimulates the activation of BAT, leading to increased metabolic activity and heat generation. This response is crucial for newborns, who have a limited ability to regulate their body temperature compared to older children and adults. Therefore, cold stress actually promotes an increased reliance on BAT to generate the necessary heat to maintain homeostasis.

The other options do not accurately reflect the physiological response of BAT in newborns to cold stress. While some aspects relating to BAT function and weight are involved in the context of temperature regulation, the primary response to cold is indeed enhanced BAT activation and utilization, rather than a decrease in function or weight gain.