When you feel cold, the fat in your body will be converted into heat to supplement your physical strength. As long as you don't eat when you are hungry and cold, you will lose weight, but this is a process that needs persistence to succeed.

Exploring the North Pole requires both mental work and physical exercise, so people who explore the North Pole will be much thinner. Around us, if we can't eat when we are hungry and cold, we won't lose weight.