Nearly 1 in 3 Americans may have an undiagnosed iron deficiency, a problem that can lead to fatigue, brain fog and difficulty concentrating, a new study suggests. An analysis of data from more than 8,000 adults in the U.S. revealed that 14% had low iron blood levels, a condition known as absolute iron deficiency, while 15% had the right iron levels but their bodies couldn’t use the essential mineral properly, known as functional iron deficiency, according to the report published Tuesday in JAMA Network Open. Doctors don’t typically screen adults for iron deficiency, which is why the condition has been overlooked in many people. There had been hints in other studies suggesting iron deficiency might be more widespread than doctors assume. The rates of iron deficiency between men and women are more similar after the age of menopause, experts said.

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Persons: don’t, ”, Leo Buckley, “, Dr, Andrew Eisenberger, Eisenberger, ” Eisenberger, Brigham, Buckley, Johanna Contreras, Hossein Ardehali, Ardehali Organizations: Brigham, Women’s Hospital, Columbia University Vagelos College of Physicians and Surgeons, Women’s, National Health, Renal Research Institute, Molecular Cardiology, Northwestern University Feinberg School of Medicine, Research Locations: U.S, Boston, Sinai, New York City