Vitamin B12 deficiency: Symptoms may include gas, constipation and diarrhea

However, these symptoms will not necessarily signal suboptimal B12 levels.

Other signs to look out for include strange sensations, a swollen inflamed tongue, difficulty walking, weakness and fatigue.

Harvard Health explains that symptoms may appear slowly and worsen over time. However, sometimes warning signs can appear quickly.

How to Prevent B12 Deficiency?

B12 deficiency occurs naturally in animal products, making vegans and vegetarians prone to deficiency.

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