April 22, 2026
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Some of the most common signs of nutrition deficiency are also the easiest to ignore.
Many Americans may not be getting enough essential nutrients in their diets. In many cases, those gaps don’t show up right away. When they do show up, the signs are easy to ignore.
Some common health symptoms may be caused by underlying nutrient deficiencies, although other health conditions can cause similar issues. Here’s a look at a few of them.
If you feel persistently tired without a clear reason, anemia may be a cause. It occurs when your body doesn’t have enough healthy red blood cells to carry oxygen through the body. Iron, vitamin B12, and folate all play a role in producing those cells. Low levels of any of these nutrients may contribute to fatigue.
Iron is found in meats, poultry, and seafood, along with plant-based sources like beans, lentils, and spinach.
Vitamin B12 is naturally found in animal products, including meat, fish, poultry, eggs, and dairy products. Some plant-based foods are fortified with it.
Foods containing folate include beans, lentils, peanuts, sunflower seeds, and whole grains, as well as eggs, dark leafy greens, fortified cereals, yeast, and liver.
Bones that break more easily than expected may be linked to low calcium, vitamin D, or both.
Many Americans don’t get enough calcium, which is important for building and maintaining strong bones and teeth. Over time, low calcium levels may contribute to osteoporosis, a condition that makes bones more fragile and more likely to break.
Vitamin D plays a key role because it helps your body absorb calcium. Without enough vitamin D, your body may not be able to use calcium effectively. In adults, low levels can contribute to bone loss and a higher risk of fractures. In children, deficiencies in vitamin D or calcium can lead to rickets, which causes bones to become soft and weak.
Calcium is found in dairy products, leafy greens like kale and collards, and foods such as broccoli, sardines, and fortified plant-based products, including tofu and some milks and juices.
Vitamin D is found in fatty fish like salmon, tuna, and sardines, as well as egg yolks and some fortified foods. Your body also produces vitamin D when your skin is exposed to sunlight, though factors like skin tone and sunscreen use can affect how much is made.
Limited sun exposure can help support vitamin D levels for some people, but it’s important to consider your skin type and overall health and to talk with a healthcare provider about what’s appropriate.
Difficulty seeing in low light or worsening vision may be associated with low vitamin A levels.
Vitamin A helps your eyes function properly and supports the retina. Without enough of it, vision may gradually decline, particularly at night.
Foods that contain vitamin A include dairy products, eggs, and produce such as sweet potatoes, mangoes, and apricots.
If cuts take longer to heal or you bruise easily, it may be related to a vitamin C deficiency.
Vitamin C supports the immune system and helps the body produce collagen, an important part of skin, bones, and cartilage. It also acts as an antioxidant, helping protect cells from damage. In addition, vitamin C helps the body absorb iron and plays a role in producing certain hormones and amino acids.
Good sources include citrus fruits, bell peppers, broccoli, and potatoes.
Muscle cramps, twitching, or weakness may be linked to low potassium or magnesium levels.
These minerals help regulate muscle and nerve function. When levels drop, symptoms can include cramping, weakness, or irregular heart rhythms.
Potassium is found in foods like bananas, milk, and legumes. Magnesium can be found in leafy greens, whole grains, nuts, and beans.
Symptoms like fatigue or muscle cramps can have a lot of different causes, not just nutrient deficiencies. If something feels off and doesn’t go away, gets worse, or doesn’t have a clear cause, it’s a good idea to check in with a doctor.
Most people can get the nutrients they need by eating a balanced diet with fruits, vegetables, whole grains, and a mix of protein sources.
Many experts agree that eating healthy foods is a better way to get essential vitamins and minerals than taking nutritional supplements.
