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Many diseases are caused by nutritional deficiencies. Specific nutritional needs cause easily recognized symptoms that can alert you to the need for supplements or changes in your diet.

The World Health Organization defines malnutrition as an imbalance between the dietary supply of specific nutrients and the body's demand for them for growth, maintenance, and specific bodily functions. It can be very easy to remedy nutrient deficiencies with nutritional supplements and changes in diet, but first it is necessary to recognize which nutrients are in short supply.

Pale skin can indicate an iron deficiency. It's important not to treat iron deficiency by taking supplements unless it has been confirmed by a blood test (due to the fact that some people have iron overload diseases but still get symptoms of anemia), but iron deficiency can also cause physical fatigue in adults and difficulty with mental tasks in teens.

Falls and fractures can indicate deficiencies in the nutrients needed for healthy bones. Not only calcium, but also magnesium, zinc, boron, vitamin D, and vitamin K are necessary for bone health. Calcium deficiency is seldom the only problem with brittle bones.

Goiter, a swelling in the throat, along with sensitivity to cold weather and a tendency to gain weight even when eating less can be caused by a deficiency of both iodine and selenium. Both of these micronutrients are necessary for thyroid health. Extreme deficiencies of iodine and selenium can cause Kashin-Beck disease, in which cartilage deterioriates. This condition, which occurs in parts of China where the soil is unusually low in iodine and selenium content, also causes morning joint pain and limited range of motion in many joints.

Pellagra, a disfiguring skin rash that is never itchy, is caused by a deficiency of niacin, vitamin B3. Actual niacin deficiency is rare in North America and Europe, but is not unknown in Africa and Asia.

Perifollicular hemorrhage, the appearance of little red spots when the skin bleeds around hair follicles, is a symptom of vitamin C deficiency. If the deficiency is not treated, it can progress to cause tooth loss, bleeding gums, dementia, and death. It doesn't take much vitamin C to correct the deficiency, less than 100 mg a day can make a huge difference. That's the equivalent of a low-dose vitamin C supplement or a couple of pieces of fruit.

The apperance of tiny red spots on the tongue is a possible symptom of vitamin C deficiency. However, redness of the tongue can also result from iron, folic acid, niacin, pyrodoxine, vitamin A, and zinc deficiencies. In North America, the most common deficiencies are vitamin A and zinc, since iron and the B vitamins are added to flour used in commercial baked goods. Small children who do not get enough vitamin A and zinc are especially susceptible to viral infections.

A lemon-yellow tint of the skin and a glossy, shiny, smooth appearance of the tongue can indicate vitamin B12 deficiency, especially in people past the age of 60. Some older people lose the ability to make the hormone that the digestive tract needs to absorb vitamin B12. Taking supplemental vitamin B12 can help, but only after getting a vitamin B12 shot. Failure to treat the deficiency can result in a condition called pernicious anemia.

Continue reading after recommendations

  • Brooks M. Iron Deficiency Linked to Psychiatric Disorders in Kids. Medscape Medical News. Available at Accessed 4 October 2015.
  • de Romana DL, Olivares M, Uauy R, Araya M. Risks and benefits of copper in light of new insights of copper homeostasis. J Trace Elem Med Biol. January 2011. 25:3-13.
  • Photo courtesy of The Noun Project:
  • Photo courtesy of USDAgov:

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