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Only 12% of Americans get the recommended amount of vegetables, 15% eat the minimum recommended amount of fruit and a measly 1% get the amount of whole grains needed for a healthy diet, according to a study in Circulation. And a recent survey by Purdue University determined that almost 46% of people have a markedly unhealthy diet.

Unfortunately, few folks know the signs of nutritional deficiencies and how to correct them. So, here's a quick rundown:

-- Tingling hands and/or feet, changes in the color or texture of your tongue, and mood swings may be a sign of vitamin B6, B12, thiamin, riboflavin and/or folate deficiency. B12 deficiency can also cause erectile dysfunction, urinary and fecal incontinence, and lack of balance.

-- Dermatitis and rashes may indicate a lack of vitamins A, B2, B3 and B6. Hair loss or brittle nails can signal that you need vitamin B7.

-- Fatigue can come from a mix of deficiencies, including of B vitamins, vitamin C, magnesium, zinc and iron.

If you have symptoms of poor nutrition (or know you aren't eating a healthy diet), ask your doctor to test the nutrient levels in your blood. If you're deficient, work together to design a diet that supplies needed nutrients and to determine what supplements can give you an immediate boost.

For more info on how to keep your body healthy and your ActualAge as young as possible, check out "YOU On A Diet, revised edition." And get the latest nutritional info by signing up for my free newsletter at 4YOUngveity.com.

Health pioneer Michael Roizen, M.D., is chief wellness officer emeritus at the Cleveland Clinic and author of four No. 1 New York Times bestsellers. Check out his latest, "The Great Age Reboot: Cracking the Longevity Code for a Younger Tomorrow," and find out more at www.4YOUngevity.com. Email your health and wellness questions to Dr. Mike at questions@4YOUngevity.com.

(c)2026 Michael Roizen, M.D.

Distributed by King Features Syndicate, Inc.

(c) 2026 Michael Roizen, M.D. Distributed by King Features Syndicate, Inc.