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While people get vitamin D from food and sunlight, Dr. Michael Holick, a leading vitamin D researcher, believes that about 50 percent of the general population is at risk of deficiency. This can cause bone pain, muscle weakness, and, in severe cases, can lead to thin, brittle, or misshapen bones. That’s why it’s important we all take steps to make sure we’re getting enough of the vitamin, including being aware of the following seven signs and factors that point to deficiency:

1. Darker Skin
2. You’re Over 65 Years Old
3. You’re Moody Or Depressed
4. You’re Overweight, Obese, Or Have High Muscle Mass
5. Aching Bones And Muscles
6. Sweaty Head
7. Gastrointestinal Issues

A blood test is the only way to confirm vitamin D deficiency, but if you fit any of the above descriptors or experience these symptoms, it’s definitely worth a visit to your doctor.