A deficiency in folate, a B vitamin crucial for red blood cell production, can manifest as fatigue, headaches, and memory problems, according to medical experts. While folate deficiency is uncommon in the United States due to widespread food fortification, certain populations face a greater risk.
Folate is essential for the body to create healthy red blood cells. When levels are insufficient, individuals can develop anemia, a condition where the body does not efficiently deliver oxygen. This can lead to symptoms such as tiredness, weakness, and shortness of breath. According to Dr. Nada Hindiyeh, a neurologist and chief medical officer at Haven Headache & Migraine Center, fatigue is the most prevalent symptom of low folate.
Over time, a significant folate deficiency can lead to megaloblastic anemia, which in turn can cause headaches. "When someone becomes anemic, they may develop symptoms like fatigue, weakness and sometimes headache," Hindiyeh explained. "So if a headache occurs, it’s usually because of the anemia rather than the vitamin deficiency directly."
Folate also plays a role in brain health, particularly memory. A 2022 study in the European Journal for Clinical Nutrition indicated that low folate levels were associated with an accelerated decline in cognitive function, especially among older adults. Dr. Shivang Joshi, an assistant professor of neurology at the University of Massachusetts, noted that low folate is often accompanied by low vitamin B12, which is also linked to memory and cognitive decline.
"Folate is important for normal brain function, so severe deficiency has been associated with cognitive changes," Hindiyeh said. "But memory is complicated." While folate deficiency is not typically the primary suspect for memory issues, it can be a contributing factor.
Who is at risk?
Both neurologists emphasized that a true folate deficiency is rare, largely because many foods, including grains, are fortified with folic acid. Folate is naturally found in a variety of foods such as vegetables, fruits, nuts, beans, seafood, eggs, dairy products, and meats.
However, individuals with alcohol use disorder are at a higher risk. Alcohol can interfere with the body's absorption and storage of folate. Heavy alcohol consumption can also affect vitamin B12 absorption, further contributing to symptoms like fatigue and headaches. This risk is associated with chronic, heavy alcohol use rather than moderate drinking.
Conditions that impair nutrient absorption, such as celiac disease or inflammatory bowel disease, can also increase the risk of folate deficiency. Pregnant women have elevated folate needs due to their role in DNA synthesis and cell division for fetal development.
The National Institutes of Health recommends 400 micrograms of dietary folate equivalents daily for non-pregnant adults. Dietary folate equivalents account for the varying bioavailability of folate from different sources. While it is difficult to consume too much folate from natural food sources, the recommended upper limit for folate intake from supplements is 1,000 micrograms per day.
If experiencing persistent fatigue, headaches, or memory problems, consulting a healthcare provider for a serum folate test is advised to determine the underlying cause and appropriate treatment.