What Can Vitamin B12 Deficiency Cause?

Vitamin B12 is an essential nutrient. It is reported to play a role in many functions, from supporting the immune and nervous systems to producing blood cells in the bone marrow. B12 deficiency can develop gradually, and its symptoms may accumulate over time rather than appear all at once. Recognizing possible symptoms is important, as is regularly including foods that contain B12 in the diet.

Which Foods Contain Vitamin B12?

Animal foods such as red meat, chicken, fish, liver, and kidney are considered rich sources of B12. Seafood such as shrimp and mussels also contains B12 and can add variety to a weekly menu. Milk, yogurt, cheese, and eggs are other foods that contain it. Including a variety of these foods throughout the week can help provide B12. Some dairy alternatives fortified with B12 are also available for people who eat a plant-based diet.

Nervous System Symptoms

Tingling in the hands and feet may occur with B12 deficiency. B12 plays an important role in the nervous system, and a deficiency may damage nerves and cause tingling. This nerve damage may eventually limit movement, especially by making walking difficult. If these symptoms appear, see a doctor promptly and have your B12 level checked with a blood test.

Skin and Energy Symptoms

Vitamin B12 plays a role in red blood cell production, and a deficiency may cause pale-looking skin. Significant fatigue may also accompany a low blood cell count. These 2 symptoms may occur together. Persistent fatigue alongside paleness can be a reason to review the diet. These 2 conditions are generally considered together and described as reinforcing symptoms.

What Other Symptoms May Occur?

B12 deficiency is also associated with heart palpitations, shortness of breath, a burning sensation in the mouth, and mouth ulcers. Difficulty thinking, irritability, and depression may also occur. Nausea, vomiting, diarrhea, reduced appetite, and weight loss are among the other symptoms associated with B12 deficiency. If several of these symptoms occur together, do not rely on diet changes alone; see a doctor and have your B12 level checked with a blood test.

How to Add B12-Rich Foods to Meals

Liver and kidney are more flavorful and retain their texture when cooked briefly over medium heat rather than overcooked; even so, they should reach 71°C / 160°F in the center (74°C / 165°F for chicken liver). Fish can appear several times weekly in the menu, adding variety in B12 and other nutrients. Avoid overcooking eggs, and keep dairy products in the refrigerator at 4°C / 40°F or below to help preserve freshness and nutritional value. These habits can make it easier to include B12-rich foods regularly.

How to Choose Foods That Contain B12

When buying liver, choose pieces that are dark reddish-brown, glossy, and mild-smelling. Pale liver or liver with a sharp odor may have lost freshness. When choosing fish, look for bright eyes and red gills. Check the expiration date and make sure the package is not swollen when buying milk or yogurt; a swollen package can indicate spoilage. Choose eggs with uncracked shells and refrigerate them as soon as you get home.