It's ok to eat a bit more nutritious food when it's cold - your natural body heating costs energy.
Cover your head when outside, your head loses an unreasonable amount of heat.
If your bed's too cold in the evening, buy a heating pad - a warm bed feels awsome.
If your hands get painfully cold, more excruciating pain may be waiting for you when they start to heat back up. To avoid the additional pain, put your hands under cold tap water first - I promise it's going to feel warm. Then increase the heat slowly until your hands are warm again.
I think the one who cooks should do things their way and the others should not interfere unless there's some kind of medical concern.