7 Incredibly Common Nutrient Deficiencies
Most problems caused by nutritional deficiencies stop once you’re no longer deficient. But in some cases, there may be lasting damage. This usually only occurs when the deficiency has been severe and has lasted a long time.
For example, prolonged thiamine deficiency can be associated with stunted growth or depression. Nutritional deficiencies in children can be serious and lead to lasting negative health outcomes.
While it’s possible to get most nutrients from a balanced diet, the typical Western diet is low in several very important nutrients, many of which come from foods like seafood, green leafy vegetables, and yes, red meat.
This article lists 7 nutrient deficiencies that are incredibly common and can cause health problems if ignored.
𝟭. 𝗜𝗥𝗢𝗡 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Iron is an essential mineral.
It’s a large component of red blood cells, in which it binds with hemoglobin and transports oxygen to your cells.
The two types of dietary iron are:
• Heme iron. This type of iron is very well absorbed. It’s only found in animal foods, with red meat containing particularly high amounts.
• Non-heme iron. This type, found in both animal and plant foods, is more common. It is not absorbed as easily as heme iron.
Iron deficiency is one of the most common nutrient deficiencies in the world, affecting more than 25% of people worldwide.
This number rises to 47% in preschool children. Unless they’re given iron-rich or iron-fortified foods, they are very likely to lack iron.
Around 30% of menstruating women may be deficient as well due to monthly blood loss, and up to 42% of young, pregnant women may be deficient as well.
Additionally, vegetarians and vegans have an increased risk of deficiency because they consume only non-heme iron, which is not absorbed as well as heme iron.
The most common consequence of iron deficiency is anemia, in which the number of your red blood cells and your blood’s ability to carry oxygen drops.
Symptoms usually include tiredness, weakness, a weakened immune system, and impaired brain function.
The best dietary sources of heme iron include:
• Red meat. 3 ounces (85 grams) of ground beef provide almost 30% of the Daily Value (DV).
• Organ meat. One slice (81 grams) of liver gives more than 50% of the DV.
• Shellfish. Clams, mussels, and oysters are excellent sources of heme iron, with 3 ounces (85 grams) of cooked oysters packing roughly 50% of the DV.
• Canned sardines. One 3.75-ounce (106-gram) can offer 34% of the DV.
The best dietary sources of non-heme iron include:
• Beans. Half a cup (85 grams) of cooked kidney beans provides 33% of the DV.
• Seeds. Pumpkin, sesame, and squash seeds are good sources of non-heme iron. One ounce (28 grams) of roasted pumpkin or squash seeds contains 11% of the DV.
• Dark, leafy greens. Broccoli, kale, and spinach are rich in iron. One ounce (28 grams) of fresh kale provides 5.5% of the DV.
However, you should never supplement with iron unless you truly need it. Too much iron can be very harmful.
Notably, vitamin C can enhance the absorption of iron. Eating vitamin-C-rich foods like oranges, kale, and bell peppers alongside iron-rich foods can help maximize your iron absorption.
Iron deficiency is very common, especially among young women, children, and vegetarians. It may cause anemia, fatigue, a weakened immune system, and impaired brain function.
𝟮. 𝗜𝗢𝗗𝗜𝗡𝗘 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Iodine is an essential mineral for normal thyroid function and the production of thyroid hormones.
Thyroid hormones are involved in many bodily processes, such as growth, brain development, and bone maintenance. They also regulate your metabolic rate.
Iodine deficiency is one of the most common nutrient deficiencies, affecting nearly a third of the world’s population.
The most common symptom of iodine deficiency is an enlarged thyroid gland, also known as a goiter. It may also cause an increase in heart rate, shortness of breath, and weight gain.
Severe iodine deficiency is linked to serious harm, especially in children. It may cause mental retardation and developmental abnormalities.
Good dietary sources of iodine include:
• Seaweed. Only 1 gram of kelp packs 460–1,000% of the DV.
• Fish. Three ounces (85 grams) of baked cod provide 66% of the DV.
• Dairy. One cup (245 grams) of plain yogurt offers about 50% of the DV.
• Eggs: One large egg contains 16% of the DV.
However, these amounts can vary greatly. As iodine is found mostly in soil and ocean water, iodine-poor soil will result in low-iodine food.
Some countries mandate the enrichment of table salt with iodine, which has successfully reduced the incidence of deficiencies.
Iodine is one of the most common nutrient deficiencies in the world. It may cause enlargement of the thyroid gland. Severe iodine deficiency can cause mental retardation and developmental abnormalities in children.
𝟯. 𝗩𝗜𝗧𝗔𝗠𝗜𝗡 𝗗 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Vitamin D is a fat-soluble vitamin that functions like a steroid hormone in your body.
It travels through your bloodstream and into cells, telling them to turn genes on or off. Almost every cell in your body has a receptor for vitamin D.
Vitamin D is produced from cholesterol in your skin upon exposure to sunlight. Thus, people who live far from the equator are likely to be deficient unless their dietary intake is adequate or they supplement with vitamin D.
In the United States, about 42% of people may be deficient in this vitamin. This number rises to 74% in older adults and 82% in people with dark skin since their skin produces less vitamin D in response to sunlight.
Vitamin D deficiency is not usually obvious, as its symptoms are subtle and may develop over years or decades.
Adults who are deficient in vitamin D may experience muscle weakness, bone loss, and an increased risk of fractures. In children, it may cause growth delays and soft bones (rickets).
Also, vitamin D deficiency may play a role in reduced immune function and an increased risk of cancer.
While very few foods contain significant amounts of this vitamin, the best dietary sources are:
• Cod liver oil. A single tablespoon (15 ml) packs 227% of the DV.
• Fatty fish. Salmon, mackerel, sardines, and trout are rich in vitamin D. A small, 3-ounce (85-gram) serving of cooked salmon provides 75% of the DV.
• Egg yolks. One large egg yolk contains 7% of the DV.
People who are deficient may want to take a supplement or increase their sun exposure. It is hard to get sufficient amounts through diet alone.
Vitamin D deficiency is very common. Symptoms include muscle weakness, bone loss, an increased risk of fractures, and — in children — soft bones. It is very difficult to get sufficient amounts from your diet alone.
𝟰. 𝗩𝗜𝗧𝗔𝗠𝗜𝗡 𝗕𝟭𝟮 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Vitamin B12, also known as cobalamin, is a water-soluble vitamin.
It is essential for blood formation, as well as brain and nerve function.
Every cell in your body needs B12 to function normally, but your body is unable to produce it. Therefore, you must get it from food or supplements.
B12 is only found in sufficient amounts in animal foods, although certain types of seaweed may provide small quantities. Therefore, people who do not eat animal products are at an increased risk of deficiency.
Studies indicate that up to 80–90% of vegetarians and vegans may be deficient in vitamin B12.
More than 20% of older adults may also be deficient in this vitamin since absorption decreases with age.
B12 absorption is more complex than that of other vitamins because it’s aided by a protein known as intrinsic factor. Some people are lacking in this protein and may thus need B12 injections or higher doses of supplements.
One common symptom of vitamin B12 deficiency is megaloblastic anemia, which is a blood disorder that enlarges your red blood cells.
Other symptoms include impaired brain function and elevated homocysteine levels, which is a risk factor for several diseases.
Dietary sources of vitamin B12 include:
• Shellfish. Clams and oysters are rich in vitamin B12. A 3-ounce (85-gram) portion of cooked clams provides 1,400% of the DV.
• Organ meat. One 2-ounce (60-gram) slice of liver packs more than 1,000% of the DV.
• Meat. A small, 6-ounce (170-gram) beef steak offers 150% of the DV.
• Eggs. One whole egg provides about 6% of the DV.
• Milk products. One cup (240 ml) of whole milk contains about 18% of the DV.
• Vitamin B12 isn’t considered harmful in large amounts because it’s often poorly absorbed and easily excreted.
Vitamin B12 deficiency is very common, especially in vegetarians, vegans, and older adults. The most common symptoms include blood disorders, impaired brain function, and elevated homocysteine levels.
𝟱. 𝗖𝗔𝗟𝗖𝗜𝗨𝗠 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Calcium is essential for every cell in your body. It mineralizes bones and teeth, especially during times of rapid growth. It is also very important for bone maintenance.
Additionally, calcium serves as a signaling molecule. Without it, your heart, muscles, and nerves would not be able to function.
The calcium concentration in your blood is tightly regulated, and any excess is stored in bones. If your intake is lacking, your bones will release calcium.
That is why the most common symptom of calcium deficiency is osteoporosis, characterized by softer and more fragile bones.
One survey in the United States found that fewer than 15% of teenage girls, fewer than 10% of women over 50, and fewer than 22% of teenage boys and men over 50 met the recommended calcium intake.
Although supplementing increased these numbers slightly, most people were still not getting enough calcium.
Symptoms of more severe dietary calcium deficiency include soft bones (rickets) in children and osteoporosis, especially in older adults.
Dietary sources of calcium include:
• Boned fish. One can (92 grams) of sardines contains 44% of the DV.
• Dairy products. One cup (240 ml) of milk provides 35% of the DV.
• Dark green vegetables. Kale, spinach, bok choy, and broccoli are rich in calcium. Just 1 ounce (28 grams) of fresh kale offers 5.6% of the DV.
The effectiveness and safety of calcium supplements have been somewhat debated in the last few years.
Some studies demonstrate an increased risk of heart disease in people taking calcium supplements, although other studies have found no effects.
While it’s best to get calcium from food rather than supplements, these supplements seem to benefit people who are not getting enough in their diet.
Low calcium intake is very common, especially in women of all ages and older adults. The main symptom of calcium deficiency is an increased risk of osteoporosis later in life.
𝟲. 𝗩𝗜𝗧𝗔𝗠𝗜𝗡 𝗔 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Vitamin A is an essential fat-soluble vitamin. It helps form and maintain healthy skin, teeth, bones, and cell membranes. Furthermore, it produces eye pigments, which are necessary for vision.
There are two different types of dietary vitamin A:
• Preformed vitamin A. This type of vitamin A is found in animal products like meat, fish, poultry, and dairy.
• Pro-vitamin A. This type is found in plant-based foods like fruits and vegetables. Beta carotene, which your body turns into vitamin A, is the most common form.
More than 75% of people who eat a Western diet get more than enough vitamin A and do not need to worry about a deficiency.
However, vitamin A deficiency is very common in many developing countries. About 44–50% of preschool-aged children in certain regions have vitamin A deficiency. This number is around 30% in Indian women.
Vitamin A deficiency can cause both temporary and permanent eye damage and may even lead to blindness. In fact, this deficiency is the world’s leading cause of blindness.
Vitamin A deficiency can also suppress immune function and increase mortality, especially among children and pregnant or breastfeeding women.
Dietary sources of preformed vitamin A include:
• Organ meat. One 2-ounce (60-gram) slice of beef liver provides more than 800% of the DV.
• Fish liver oil. One tablespoon (15 ml) packs roughly 500% of the DV.
Dietary sources of beta carotene (pro-vitamin A) include:
• Sweet potatoes. One medium, 6-ounce (170-gram) boiled sweet potato contains 150% of the DV.
• Carrots. One large carrot provides 75% of the DV.
Dark green, leafy vegetables. One ounce (28 grams) of fresh spinach provides 18% of the DV.
While it is very important to consume enough of this vitamin, too much preformed vitamin A may cause toxicity.
This does not apply to pro-vitamin A, such as beta carotene. High intake may cause your skin to turn slightly orange, but this effect isn’t dangerous.
Vitamin A deficiency is very common in many developing countries. It may cause eye damage and blindness, as well as suppress immune function and increase mortality among women and children.
𝟳. 𝗠𝗔𝗚𝗡𝗘𝗦𝗜𝗨𝗠 𝗗𝗘𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬
Magnesium is a key mineral in your body.
Essential for bone and teeth structure, it’s also involved in more than 300 enzyme reactions.
Almost half of the U.S. population consumes less than the required amount of magnesium.
Low intake and blood levels of magnesium are associated with several conditions, including type 2 diabetes, metabolic syndrome, heart disease, and osteoporosis.
Low levels are particularly common among hospitalized patients. Some studies find that 9–65% of them are deficient.
Deficiency may be caused by disease, drug use, reduced digestive function, or inadequate magnesium intake.
The main symptoms of severe magnesium deficiency include abnormal heart rhythm, muscle cramps, restless leg syndrome, fatigue, and migraines.
More subtle, long-term symptoms that you may not notice include insulin resistance and high blood pressure.
Dietary sources of magnesium include:
• Whole grains. One cup (170 grams) of oats contains 74% of the DV.
• Nuts. Twenty almonds pack 17% of the DV.
• Dark chocolate. One ounce (30 grams) of dark chocolate offers 15% of the DV.
• Dark green, leafy vegetables. One ounce (30 grams) of raw spinach provides 6% of the DV.
Magnesium deficiency is common in Western countries, and low intake is associated with many health conditions and diseases.
𝗧𝗛𝗘 𝗕𝗢𝗧𝗧𝗢𝗠 𝗟𝗜𝗡𝗘
It is possible to be deficient in almost every nutrient. That said, the deficiencies listed above are by far the most common.
Children, young women, older adults, vegetarians, and vegans seem to be at the highest risk of several deficiencies.
The best way to prevent deficiency is to eat a balanced diet that includes whole, nutrient-dense foods. However, supplements may be necessary for those who can’t obtain enough from diet alone.
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