Mitochondria generate heat by burning nutrients and oxygen to produce energy. When we stay in constant comfort (around 72°F indoors), they aren’t challenged, and over time, they become less flexible in how they create energy. Cold exposure encourages mitochondria to switch fuel pathways. This metabolic flexibility helps maintain steady energy and heat production, even in colder environments. You don’t need an intense cold plunge, simply spending intentional time outside in the cold, can make a r