How to identify a nutrient deficiency
Symptom: Numbness or tingling in limbs.
Possible deficiency: Vitamin B12.
Most at risk for vitamin B12 deficiency are vegans, older adults, weight loss surgery patients, antacid users, and those taking metformin (a diabetes drug).
What to eat: Fish, beef, yogurt, cheese, tempeh, nutritional yeast.
Supplement with: 500-750 mcg each of methylcobalamin and adenosylcobalamin daily.