Do you catch colds or the flu easily? One possible cause may be low levels of vitamin D. Ask your doctor to test your vitamin D in your next blood test. And check back tomorrow for another possible culprit of low resistance to colds and flu.
Even if you eat a balanced, whole-foods diet, you may still be missing vital nutrients. And even low-level vitamin deficiencies can sap energy, diminish immune function, and lead to mood swings and brain fog. Here's a look at some of the most common deficiencies-and what you can do about them.
Regardless of where you live-in a hot, sunny climate or further north-it's quite possible that you aren't getting enough of the sunshine vitamin. It's estimated that 80 percent of Americans are deficient in vitamin D. To test your knowledge of this essential nutrient, take our quiz.