2. You are experiencing significant weakness
If you are feeling excessively and noticeably weak, it could be because you are deficient in vitamin D. This vitamin allows your body to maintain its power and strength. Researchers have found that vitamin D aids in muscle control, so if you are finding it difficult to perform even the most basic tasks, such as opening a jar or walking up a flight of stairs, it might be that you have low levels of this important vitamin.
Taking supplements or modifying your diet to include more foods that help your body produce vitamin D could help to restore your strength.