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- Patient - Malnutrition (Oct. 16, 2026)
malnutrition
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What is malnutrition?
Malnutrition is an impaired bodily function resulting from prolonged deficiency or excess of total energy or specific nutrients. It can stem from inadequate food availability, unwise food choices, anorexia, or chronic illnesses. Symptoms include weight loss, fatigue, muscle weakness, decreased immune function, and mental disturbances. Children may experience stunted growth and long-term developmental issues. Treatment involves dietary adjustments, supplements, and, in severe cases, hospitalization. Globally, chronic undernutrition affects millions, particularly in Asia and sub-Saharan Africa.
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How does the body get affected by malnutrition?
Malnutrition impacts the body in many ways, with symptoms including weight loss, fatigue, and muscle weakness. It can also lead to decreased immune function, dry skin, tooth decay, osteoporosis, dizziness, and mental disturbances such as an inability to concentrate. In children, prolonged malnutrition can result in them being chronically underweight and not developing normally, which can cause long-term consequences like short stature.
Inadequate nutrition, especially a lack of protein, can cause immune deficiency, impairing antibody responses and cell-mediated immunity. Chronic undernutrition, particularly protein-energy malnutrition (PEM), is prevalent worldwide and results in weight loss, stunted growth, and wasting of body fat and muscle.
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What are the common signs and symptoms of malnutrition?
Malnutrition symptoms include weight loss, fatigue, and muscle weakness. A person may experience decreased immune function, dry skin, tooth decay, and dizziness. Mental disturbances such as the inability to concentrate can also occur.
Children with prolonged malnutrition may be underweight and experience stunted growth, resulting in short stature. Marasmus, a type of protein-energy malnutrition, is characterized by growth retardation and wasting of subcutaneous fat and muscle. Additional signs can include behavioral changes, brittle hair, dehydration, diarrhea, and low blood pressure.
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What causes someone to become malnourished?
Malnutrition is impaired function from prolonged deficiency or excess of energy or nutrients. Causes include inadequate food due to poor agriculture, distribution, poverty, or alcoholism. Poor eating habits, preferences, or reliance on non-nutritious foods also contribute.
Conditions like anorexia, vomiting, malabsorption, and illnesses such as cancer or AIDS can lead to malnutrition. Limited food, unwise choices, or excessive supplement use can also be factors. Socioeconomic factors and food deserts play a role, with complex interactions between supply, demand, and personal food preferences.
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What organs and systems are most affected by malnutrition?
Malnutrition impacts multiple organs and systems, and its symptoms are often apparent. Individuals affected by malnutrition commonly experience weight loss, fatigue, and muscle weakness.
Other effects of malnutrition:
* Immune System: Malnutrition can cause immune deficiency by impairing antibody responses and cell-mediated immunity.
* Endocrine System: Starvation or malnutrition can result in reduced thyroid hormone production, which lowers metabolic rate, and can also decrease the production of gonadotropins and sex steroids.
* Multiple Organ Systems: Metabolic defects affecting the digestive tract, liver, or kidneys can lead to malnutrition by hindering the digestion, absorption, and metabolism of food.
* Growth and Development: In children, malnutrition can cause stunted growth and increased susceptibility to infection. Vitamin deficiencies can lead to diseases such as rickets (vitamin D deficiency), scurvy (vitamin C deficiency), and beriberi (thiamine deficiency).
* Blood: Iron deficiency, the most common nutritional deficiency, can lead to microcytic hypochromic anemia, characterized by fatigue, weakness, and impaired development.5 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How can malnutrition be treated and prevented?
Malnutrition treatment depends on the cause and severity, and can include dietary adjustments, supplements, or, in severe cases, hospitalization with feeding tubes. Ready-made meals using ingredients like chickpeas, peanuts, and bananas can restore gut health and overall metabolic function.
Prevention strategies include food delivery services, especially for the elderly, and educational programs promoting balanced diets. Addressing underlying issues like poverty and food scarcity is also crucial. Protein-rich supplements can combat undernutrition, particularly in less-developed countries.
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malnutrition, physical condition resulting either from a faulty or inadequate diet (i.e., a diet that does not supply normal quantities of all nutrients) or from a physical inability to absorb or metabolize nutrients.
Acquired causes
Malnutrition may be the result of several conditions. First, sufficient and proper food may not be available, because of inadequate agricultural processes, imperfect distribution of food, or certain social problems such as poverty or alcoholism. In these instances, the cause of malnutrition is most often found to be a diet quantitatively inadequate in calories or protein.
Malnutrition may also result when certain foods containing one or more of the essential vitamins or minerals are not included in the diet. This commonly leads to specific nutritional deficiency diseases. Aging, sickness, and other factors that contribute to poor appetite can result in inadequate food consumption. Likewise, poor eating habits and food preferences may lead to malnutrition through the habitual consumption of certain foods to the exclusion of others or of large quantities of nonnutritious foods. In certain parts of Africa, for example, the practice of weaning breast-fed infants to a diet consisting chiefly of one kind of starchy food, such as cassava, may lead to protein deficiency (see kwashiorkor). In parts of East Asia, a restricted selection of foods and a preference for white polished rice as a dietary staple has led to the prevalence of a deficiency of thiamin (vitamin B1), which is found mainly in the germ and bran of grain (see beriberi). Multiple deficiencies are more likely to occur than single deficiencies, though the manifestations of one type usually predominate.
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Role of metabolic defects
Malnutrition can also arise from acquired or inherited metabolic defects, notably those involving the digestive tract, liver, kidney, and red blood cells. These defects cause malnutrition by preventing the proper digestion, absorption, and metabolism of foodstuffs by organs and tissues.
Symptoms and treatment
Symptoms of malnutrition typically are self-apparent, with affected individuals commonly exhibiting weight loss, fatigue, and muscle weakness. Decreased immune function, dry skin, tooth decay, osteoporosis, dizziness, and mental disturbances (e.g., inability to concentrate) may also be present. Children who experience malnutrition over a prolonged period tend to be chronically underweight and may not develop normally, resulting in long-term consequences such as short stature.
Treatment for malnutrition depends on the cause. Food or meal delivery services may be used to ensure access to food, particularly in the case of elderly individuals. Persons who are severely affected may require hospitalization and use of a feeding tube. In many cases, however, simple dietary adjustments can readily reverse most harmful effects of malnutrition. Dietary supplements, such as vitamins and minerals, may be taken to aid recovery. Pastes or meals made from a specific combination of foods, with ingredients such as chickpeas, peanuts, bananas, and healthy oils, can greatly benefit the rehabilitation of normal gut microbial populations. Research in malnourished children has shown that such combinations of nutrients and accompanying improvements in the gut microbiome not only promote weight gain but also help restore overall metabolic function, which can impact bone growth, immunity, and other factors.
See also nutrition and nutritional disease.
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