As a homothermal animal, the human body temperature is regulated at approximately 37°C or 98.4°F. Anything below that, and you are supposed to protect your body from a lower temperature.
The temperature of surroundings is less than your body temperature during winters.
Feeling tired, dizzy and cold all the time could be because of anaemia or iron deficiency resulting in poor blood circulation during winters.
Often when you are sad, you feel like snuggling into a blanket. You feel cold when you are sad because your energy levels and body temperatures are intimately connected.
Diabetes affects blood circulation and therefore the sensitivity to temperatures.
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