The Anonymous Widower

Does Miserable Weather Deplete Your B12?

I have been feeling down this winter and especially in the last few weeks.

My three-monthly B12 injection is now due, but I can’t get one until the second of February.

But on miserable days like this, I do feel bad. So I have asked for the injection to be moved forward?

In answer to my question, Google AI gave this answer.

Yes, cold, dark, and “miserable” winter weather can contribute to lower Vitamin B12 levels, or at least worsen an existing deficiency.

While miserable weather does not directly “burn” B12 out of your body, the associated lifestyle changes and reduced sunlight can cause levels to drop.

Here is how winter weather affects B12:

Reduced Sun Exposure: While Vitamin D is directly linked to sunlight, the general reduction in sunlight during winter can affect energy levels and mood. Low Vitamin B12 can also cause similar symptoms, making it harder to distinguish between a vitamin deficiency and “winter blues”.
Dietary Changes: In winter, people may consume less of the fresh, nutrient-dense foods (like animal products) that are high in B12, or they may feel less motivated to maintain a balanced diet, leading to lower intake.
Increased Stress and Fatigue: Cold, dark weather can induce stress. Chronic stress and fatigue are known to deplete B vitamin reserves, including B12.
Increased Sensitivity to Cold: Ironically, if you are already slightly deficient in B12, you may feel much colder, more tired, and more lethargic than others, exacerbating the feeling of “miserable” weather.

January 26, 2026 - Posted by AnonW | Food, Health | B12 Injection, Vitamin B12