This nutrient deficiency could be the culprit behind your brain fog, sluggishness, and lack of concentration
Iron deficiency anemia (IDA) can be a plausible explanation for tiredness and mental sluggishness, but it is not the only one. Brain fog, low energy and poor concentration overlap with sleep loss, stress, thyroid problems, depression, medication effects and other nutrient gaps. That means the headline symptom pattern is useful as a signal to look deeper, not as proof of one specific cause.
The key clinical point is that IDA is a diagnosis, not just a feeling. Blood tests can distinguish low iron stores from other forms of anemia and from non-anemia causes of fatigue. That matters because treatment should track the cause: menstrual blood loss, gastrointestinal bleeding, low intake, impaired absorption or inflammation may require very different follow-up. Replacing iron without understanding the source can miss a treatable problem.
For readers, the most practical takeaway is to notice patterns. Symptoms that persist, worsen with exertion, or show up alongside pale skin, dizziness, shortness of breath or palpitations deserve medical review rather than self-correction alone. Keeping track of when symptoms occur, how long they last and whether they relate to periods, diet, training load or illness can help a clinician interpret the picture more accurately.
Food and supplements can help, but they are not harmless by default. Iron-rich eating patterns may support recovery, yet supplements can cause digestive side effects and are not ideal for everyone. Absorption also varies, so โmoreโ is not always โbetter.โ The safest approach is targeted testing, cause-finding and guided treatment rather than treating brain fog as a standalone nutrition problem.
What is anemia?
Get a proper diagnosis
Describe your symptoms to your doctor and donโt minimize them. โIf you even think that youโre not feeling okay or somethingโs a little bit off, donโt brush it off as nothing,โ Taylor suggests. โJust go get checked, get a blood panel run, and make sure your levels are okay.โ Your doctor will run tests and look for red blood cell size and color, check the percentage of your blood volume made up with red blood cells, monitor your hemoglobin and ferritin levels. For Taylor, her checkup revealed her IDA diagnosis. โMy hemoglobin was around 10.0 or 10.1โ Taylor says. โSo, pretty low.โIdentify the underlying cause
If youโre diagnosed with IDA, itโs important to know whatโs causing the disorder. โAnemia can be caused by nutritional deficiencies, bleeding, certain medications, and some forms can be inherited,โ Nikka Kanani, a naturopathic doctor in Costa Mesa, California tells Fortune. โWomen who are menstruating, pregnant women, and people with chronic health conditions are often most at risk for anemia.โ Unfortunately, some doctors donโt dig deep enough for answers. โMy biggest pet peeve is when individuals are found to have iron deficiency and instructed to take iron supplements,โ says Bloomberg. โHowever, they are never evaluated for the actual cause of the anemia.โ If your panel points to anemia, your doctor can order additional testing to identify the underlying cause. Taylor, who owns a laser engraving shop, attributes her anemia to her periods. โI have a pretty heavy and long menstrual cycle,โ she says. โThat is likely the cause because theyโve run every other test.โFind the right solutionsย
After figuring out the underlying cause, the next plan of action is treatment. For many, iron supplements are the answer. Your doctor may recommend over-the-counter iron pills to replenish the iron stores in your body. However, these tablets are not a one-size-fits-all solution. โI tried taking oral iron, but my body didnโt process it,โ says Taylor. โI tried different forms of that and that just didnโt work.โ Now, the mom of two, who had to focus extra hard to do her job successfully, gets Venofer iron infusions. Administered intravenously, it takes up to three weeks to feel the effects and last about six months. โI feel normal after having it and it definitely clears up the brain fog,โ Taylor says.Make lifestyle changesย
To keep brain fog at bay, lifestyle changes help too. โLifestyle habits contribute to brain fog, especially high stress levels, which can negatively impact all aspects of our lives,โ says Bloomberg. โStress reduction techniques, such as meditation, yoga, and simply spending time in nature can help reduce stress levels.โ Taylor knows this firsthand. In addition to her iron infusions, she stays active by using an at-home elliptical machine. She also incorporates iron-rich foods like red meat and lentils into her diet. โEating a diet rich in the nutrients required to produce red blood cells can help alleviate symptoms of anemia, which includes iron, vitamin B12 and folate,โ says Bloomberg. โTaking vitamin C with iron-rich foods can increase iron absorption.โBoost energy and increase productivity
With the proper treatment, those with IDA will see an improvement in their everyday lives. Their energy levels can increase, as well as their productivity. โWhen my hemoglobin is up and my ironโs good, thereโs basically no brain fog,โ says Taylor. โI can think clearly and process things clearly.โ Taylor adds, โYou just donโt know how bad you feel until itโs corrected. Itโs like a veil has been lifted. I am a different person.โ More on nutrition and supplements:Enjoyed this article? Sign up for our newsletter to receive regular insights and stay connected.