• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
LifeNutrition

This nutrient deficiency could be the culprit behind your brain fog, sluggishness, and lack of concentration

By
Karla Pope
Karla Pope
Down Arrow Button Icon
By
Karla Pope
Karla Pope
Down Arrow Button Icon
April 12, 2024, 8:29 PM ET
Photo of woman working on her laptop
“When someone has anemia, they don’t have enough circulating red blood cells, so their body can’t operate at 100%,” says Maya Bloomberg, a nurse practitioner specializing in hematology.Getty Images

Can’t focus on the task at hand or feeling sluggish beyond the afternoon slump? One possible cause: iron-deficiency anemia (IDA). 

About 3 million Americans have anemia, according to the U.S. Centers for Disease Control and Prevention (CDC), and those are just the people who’ve been diagnosed. Many others live with the condition for years without realizing it. 

“I think I’ve had low iron for years,” Lisa Taylor, a 42-year-old business owner in McKinney, Texas, tells Fortune. “I remember in my early twenties I went to donate blood and almost passed out. I started to get a little sweaty and a little dizzy. I didn’t say anything.” 

Like Taylor, many people with IDA overlook or downplay their symptoms prior to receiving a proper diagnosis. 

“When someone has anemia, they don’t have enough circulating red blood cells so their body can’t operate at 100%,” Maya Bloomberg, a nurse practitioner in the hematology division at the University of Miami Miller School of Medicine, tells Fortune. “Common symptoms include fatigue, weakness, shortness of breath, chest pain, headaches, palpitations, pale skin, dizziness, cold hands and feet.”

When decreased oxygen is being delivered to the brain, it can also cause brain fog. Bloomberg adds, “This symptom can lead to difficulty thinking, concentrating, processing information, problem solving, forgetfulness, and feeling mentally sluggish.”

For many working people, productivity is a top priority. If you’re unable to complete your projects or meet certain deadlines due to struggles with IDA, it could impact your career.  

The first step to combating these symptoms and addressing the disorder is to schedule a checkup with your doctor to find out what’s causing the anemia.  

What is anemia?

  • The CDC defines IDA as anemia that is caused when people do not get enough iron.
  • It is diagnosed when a blood test shows a hemoglobin value of less than 13.5 gm/dl in a man or less than 12.0 gm/dl in a woman.
  • Anemia is the most common blood disorder in the United States. 

Get a proper diagnosis

Describe your symptoms to your doctor and don’t minimize them.   

“If you even think that you’re not feeling okay or something’s a little bit off, don’t brush it off as nothing,” Taylor suggests. “Just go get checked, get a blood panel run, and make sure your levels are okay.”

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, and monitor your hemoglobin and ferritin levels.    

For Taylor, her checkup revealed her IDA diagnosis. “My hemoglobin was around 10.0 or 10.1,” Taylor says. “So, pretty low.” 

Identify the underlying cause

If you’re diagnosed with IDA, it’s important to know what’s causing the disorder.  

“Anemia can be caused by nutritional deficiencies, bleeding, certain medications, and some forms can be inherited,” Nikka Kanani, a naturopathic doctor in Costa Mesa, Calif., tells Fortune. “Women who are menstruating, pregnant women, and people with chronic health conditions are often most at risk for anemia.”

Unfortunately, some doctors don’t dig deep enough for answers. 

“My biggest pet peeve is when individuals are found to have iron deficiency and instructed to take iron supplements,” says Bloomberg. “However, they are never evaluated for the actual cause of the anemia.” 

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. 

“I have a pretty heavy and long menstrual cycle,” she says. “That is likely the cause because they’ve run every other test.”

Find the right solutions 

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. 

“I tried taking oral iron, but my body didn’t process it,” says Taylor. “I tried different forms of that and that just didn’t work.” 

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. 

“I feel normal after having it and it definitely clears up the brain fog,” Taylor says.

Make lifestyle changes 

To keep brain fog at bay, lifestyle changes help too. “Lifestyle habits contribute to brain fog, especially high stress levels, which can negatively impact all aspects of our lives,” says Bloomberg. “Stress reduction techniques, such as meditation, yoga, and simply spending time in nature can help reduce stress levels.”

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. 

“Eating 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,” says Bloomberg. “Taking vitamin C with iron-rich foods can increase iron absorption.”

Boost 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. 

“When my hemoglobin is up and my iron’s good, there’s basically no brain fog,” says Taylor. “I can think clearly and process things clearly.” 

Taylor adds, “You just don’t know how bad you feel until it’s corrected. It’s like a veil has been lifted. I am a different person.”

More on nutrition and supplements:

  • Do turmeric supplements really treat pain, boost mood, and improve allergies? Experts say they work best for 2 conditions
  • Does apple cider vinegar really help with weight loss and lower cholesterol? Experts explain the science-backed benefits and how much to take
  • The dark side of daily vitamin D supplements: After a man died from an ‘overdose’ in the UK, experts explain how much is healthy
  • Is colostrum a new superfood? Experts explain its immune-boosting benefits
Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Author
By Karla Pope
See full bioRight Arrow Button Icon

Latest in Life

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.


Latest in Life

woman holding coffee in a to-go cup
LifestyleNutrition
Starbucks responds to America’s protein craze by testing a special new latte
By Beth GreenfieldJune 11, 2025
10 months ago
Why drinking sugar may be worse than eating it
LifestyleNutrition
Why drinking sugar may be worse than eating it
By Beth GreenfieldJune 10, 2025
10 months ago
Young hiker drinking from reusable water bottle
LifestyleNutrition
Your reusable water bottle may be a breeding ground for strep and fecal bacteria. Here’s how to keep it clean
By Amanda LoudinJune 10, 2025
10 months ago
This plant compound could lower your risk of heart disease and diabetes, according to new research
LifestyleNutrition
This plant compound could lower your risk of heart disease and diabetes, according to new research
By Ani FreedmanJune 4, 2025
10 months ago
Author John Green has advice for Gen Z to ‘shrink the empathy gap’
LifestyleGen Z
Author John Green has advice for Gen Z to ‘shrink the empathy gap’
By Alexa MikhailMay 31, 2025
10 months ago
Protein bars may not have the health benefits that you think, study finds
LifestyleNutrition
Protein bars may not have the health benefits that you think, study finds
By Ani FreedmanMay 30, 2025
10 months ago

Most Popular

The U.S. government is spending $88 billion a month in interest on national debt—equal to spending on defense and education combined
Economy
The U.S. government is spending $88 billion a month in interest on national debt—equal to spending on defense and education combined
By Fortune EditorsApril 9, 2026
13 hours ago
2 years ago, Saudi Arabia quietly canceled the ‘petrodollar’ deal with America that wired the world economy for 50 years. Then war broke out in Iran
Energy
2 years ago, Saudi Arabia quietly canceled the ‘petrodollar’ deal with America that wired the world economy for 50 years. Then war broke out in Iran
By Fortune EditorsApril 7, 2026
2 days ago
The U.S. had a national debt ‘home run’ in its grasp, says Jamie Dimon. But the government did nothing, and now its best option is crisis management
Economy
The U.S. had a national debt ‘home run’ in its grasp, says Jamie Dimon. But the government did nothing, and now its best option is crisis management
By Fortune EditorsApril 8, 2026
2 days ago
Self-made billionaire MrBeast says his work-life balance is nonexistent and calls it a ‘miracle’ if he works less than 15-hour days: ‘I live to work’
Success
Self-made billionaire MrBeast says his work-life balance is nonexistent and calls it a ‘miracle’ if he works less than 15-hour days: ‘I live to work’
By Fortune EditorsApril 8, 2026
1 day ago
Gen Z workers are so fearful AI will take their job they’re intentionally sabotaging their company’s AI rollout
AI
Gen Z workers are so fearful AI will take their job they’re intentionally sabotaging their company’s AI rollout
By Fortune EditorsApril 8, 2026
1 day ago
Gen Z doesn't want your full-time job. They want several part-time roles, and it's reshaping the entire workforce
Success
Gen Z doesn't want your full-time job. They want several part-time roles, and it's reshaping the entire workforce
By Fortune EditorsApril 9, 2026
16 hours ago