Over time our bodies are able to adjust to the world around us, it is a fairly slow process taking weeks or months, but as the body detects the changes in environment it changes the hormonal balance in the body, which then changes how our bodies process energy. Your blood “thickens” (it doesn’t actually but the way you circulate blood does change)
When you are exposed to cold temperatures, your body starts converting some of your fat tissue into “brown fat.” Brown fat burns fat molecules for heat. Essentially, your baseline metabolism increases and your body is burning more energy just sitting around. Rodents and smaller mammals (including infant humans) tend to have a lot of brown fat to keep themselves warm in the winter. However this is still a newer area of research and not much is definitively known about these processes.
Some more info: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5777285/
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