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Vitamin B12 deficiency can be caused by a poor diet, so aim to get more lean meat, fish, and dairy into your meals. But sometimes low levels are triggered by an absorption issue. If your diet is high in B12 but you shiver all the time, check in with your doctor for a vitamin B12 test. RELATED : 21 Important Facts About Vitamin B12 Deficiency You're a woman Find yourself in a constant battle with your spouse or male officemates for control of the thermostat ? Turns out that feeling cold really is a gendered condition. In general, women are better at conserving heat than men.