Or, hear me out: take a cold shower for a minute, then turn it slightly warm. It will be painful. Repeat every day. Go outside with one less layer than normal, shiver for 5 minutes. Do this literally every day. Pretty soon, cold adaptation. The human body is nice like that, and your vascular system will thank you. Unless you have a really bad heart condition that wouldn't allow cardio obviously because your heart rate will go up.
People ought to be careful with the going outside thing. Like, if you're just going out into your yard or apartment complex then it's fine. If you're commuting and there's the possibility that you might end up stranded where there's no climate control, then please at least stick that extra layer in your backpack or something.
I had somewhat severe hypothermia once, and it's an insidious thing. I got colder and colder until I just stopped noticing it, and then I stopped noticing most things. I didn't realize what was happening to me, and I would have died if I had been alone. I had others who saw my slack, dumb face and my kinda blue lips and helped me, but I'm not going to risk ever going through that again, and I'd encourage everyone to please be careful. Keeping a coat or hat or whatever with you is worth the hassle.
Yes, absolutely be safe and always carry enough layers to keep warm everywhere. I was just talking about waking the dog in the front yard for 5 minutes etc.
You also need to eat fatty food unless you are already fat. Since cold adaption is basically your body turning white fat into brown fat, because of cold exposure. Which then gets burned for heat. Your body can’t create brown fat if you don’t have enough fat in your body.
What does fat mean? I have a BMI of about 22, which isn’t overweight, but I have also been healthy with less fat on my body and I can pinch my stomach or thigh, so there is subcutaneous fat.
I ask because my gallbladder hates it when I eat fatty foods, so other than a handful of peanuts or a couple tablespoons of oil or sauce, I can’t actually eat much fat. Can I just eat a lot more other food?