We all know vitamin D is an important vitamin that we should be aware of. But most of us don’t know much more about it, where it comes from, or what happens if we don’t get enough of it. In fact, a lack of vitamin D can lead to muscle weakness, bone pain, or, even worse, brittle, thin, or even misshapen bones. So it’s safe to say, vitamin D is no joke and we should all be making sure we’re getting plenty of it. Here are 7 signs that you’re not getting enough of the important vitamin.

YOU HAVE SWEATY HEAD

This is actually one of the first signs of a vitamin D deficiency. So if you find that your head is becoming increasingly sweaty, then it’s safe to say you need more vitamin D.

YOU’RE OVERWEIGHT OR OBESE

Vitamin D is actually a fat-soluble vitamin. So if someone has a higher percentage of fat, they, unfortunately, require a higher amount of vitamin D than those with low percentages of fat. This is true for muscle mass as well.

DARKER SKIN

In simple terms, darker skin pigments essentially act as a natural sunblock. More specifically, people with darker skin need roughly 10 times more sun exposure than people with lighter skin to take in the same amount of vitamin D. So, if you have darker skin, just know you have a higher risk of vitamin D deficiency regardless of how much time you may spend in the sun.

YOU’RE 65 OR OLDER

People over the age of 65 are more likely to have a vitamin D deficiency simply because of the fact that many of them just spend more time indoors. This may seem like an unfair generalization, but it’s still generally true. Also, when they are outside, they don’t produce the vitamin as effectively as younger people.

YOU SUFFER FROM DEPRESSION

A recent study took place in which 80 elderly patients were their subjects. They were surprised to find that the patients with the lowest levels of vitamin D were 11 times more likely to have depression than those with appropriate amounts of the vitamin.

YOU HAVE ACHING MUSCLES AND BONES 

This is a dead giveaway that you have a vitamin D deficiency and one of the major symptoms. The pain from low vitamin D is usually felt in the back, legs, ribs, or joints. While individuals with healthy amounts of vitamin D typically feel significantly less pain in these areas.

YOU HAVE GASTROINTESTINAL ISSUES

Specifically the kinds of gastrointestinal issues that disrupt your body’s ability to store fat. This can cause a vitamin D deficiency because, as we mentioned earlier, vitamin D is fat-soluble.

If you notice any of these signs, the best thing you can do is get a blood test. It’s the only way to confirm you’re not getting enough vitamin D. Now go outside and get some sun already!