Go outside. Yes, you read that right. Go outside and get some fresh air in your lungs and sunshine on your face. Nearly 50% of Buffalonians have insufficient levels of vitamin D, and 25% are considered deficient, a recent study from the University at Buffalo found. Worse, an estimated 1 billion people worldwide are dealing with vitamin D deficiency, which means you may be deficient and don't even realize it.
And pale skin will be the least of your worries. People who have low levels of vitamin D are more likely to have lower bone density, a weakened immune system, higher susceptibility to some cancers and even increased risk of death from cardiovascular diseases; they're also more likely to have diabetes—regardless of their BMI, a study from the Endocrine Society's Journal of Clinical Endocrinology & Metabolism found.
Take your workout outside, even if it's freezing cold. Try this winter workout; it'll get blood flowing to your brain (which research shows can improve your focus, help prevent vitamin D deficiency, and keep your muscles growing).