Very high levels of vitamin B12 during pregnancy can almost triple the risk that the child develops autism spectrum disorder. In pregnant women who have both excess vitamin B12 and excess folate, the risk for autism increases 17.6 times.

Autism is a developmental disability that affects a person’s social skills, nonverbal communication, and behavior. Signs of autism usually become apparent around age 2 or 3, but in some cases, it can be diagnosed at 18 months. Asperger syndrome is a form of autism.

Excess vitamin B12 is generally due to taking high-dose supplements. It may happen following treatment with injectable vitamin B12 for a deficiency or vitamin B12 deficiency anemia. Eating a lot of meat can also raise your vitamin B12 levels.

High vitamin B12 is also found in people with the following health conditions:

You can find out your vitamin B12 status through a blood test. Because excess vitamin B12 can be a sign of other health conditions, you may have additional lab tests done.

To reduce your vitamin B12 intake and get to a safe level for pregnancy, you can adjust your diet. Animal products, including fish, shellfish, meat, poultry, eggs, and dairy are high in vitamin B12, so you can switch to more plant-based foods. Some breakfast cereals are fortified with this vitamin, so check the nutritional label before buying. Additionally, you should stop taking vitamin B12 supplements.

You can work together with a LEVY nutritionist to come up with a personalized meal plan and ensure you are getting all the right amounts of the necessary vitamins to boost your fertility and protect your baby’s health.

If your doctor finds that you have an underlying health condition linked to your high vitamin B12 level, you will have treatment to manage the condition. For instance, diabetes is treated with insulin and/or diabetes medications like metformin, along with lifestyle changes, which help to control blood sugar levels and significantly improve fertility.