Malnutrition is a wide spectrum of symptoms caused by an inadequate intake of nutrients.
Malnutrition in children (primary malnutrition) is caused by lack of dietary energy and protein; malnutrition in adults (secondary malnutrition) may be caused by diseases or conditions that interfere with nutrient intake or their use by the body.
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Malnutrition may involve stunting of growth, marasmus and kwashiorkor in infants and young children.
Treatment is based on providing an adequate and balanced diet to redress any energy, protein, vitamin or mineral deficiencies.
Poverty alleviation and nutrition education are essential if malnutrition is to be prevented in disadvantaged communities.
Alternative names
Primary malnutrition in children is also referred to as marasmus, kwashiorkor or protein-energy deficiency. In secondary malnutrition, the names of specific deficiency diseases are usually linked to the nutrients that are deficient in the diet e.g. iron deficiency, protein deficiency, energy deficiency, etc.
What is malnutrition?
Malnutrition is a wide spectrum of symptoms that occurs when one or more nutrients is lacking in the diet. These symptoms vary according to which nutrients are deficient.
Primary malnutrition is caused by a lack of energy (fats and carbohydrates) and protein in the diets of infants and children. Secondary malnutrition is caused by the lack of one or more nutrients in adult diets, ranging from energy deficiency in anorexics to vitamin deficiencies in older people with poor appetite.
What causes malnutrition?
Human beings need a wide variety of nutrients to supply essential energy, protein, vitamins and minerals to the body. If any one of these nutrients is deficient in a person’s diet, then malnutrition develops.
Generally, the most serious malnutrition occurs when the diet is deficient in energy and protein. In disadvantaged communities, diets are often lacking in energy and protein, which automatically also leads to deficiencies in most of the other essential nutrients: children suffering from energy and protein malnutrition also tend to have deficiencies of iron, calcium and other vitamins and minerals.
Adults with conditions that interfere with food uptake, such as insufficient stomach acid, a common condition in older individuals, may suffer from iron, calcium or zinc deficiencies, despite the fact that their diet may contain adequate quantities of these nutrients.
Who gets malnutrition and who is at risk?
Individuals who are dependent on others for their nourishment may be at risk for primary malnutrition, namely infants, children, the elderly, prisoners and persons who are disabled or mentally ill. Primary malnutrition is particularly prevalent in poor communities such as marginalised rural villages, urban squatter camps and refugee camps.
Secondary malnutrition may occur in people whose food intake is disturbed because of poor appetite or faulty digestion, absorption or use of nutrients in the body. Practically all diseases, including tuberculosis, eating disorders, HIV/AIDS, wasting illnesses such as cancer, and many surgical procedures can interfere with appetite or food uptake and cause malnutrition.
In South Africa, pronounced protein and/or energy malnutrition is often seen in infants and toddlers living in poor, rural areas and squatter camps, which have low levels of food, security, education and income. Malnutrition causes stunting and retardation of physical and mental development in older children and teenagers living in poverty-stricken communities.
Anyone living with HIV/AIDS has an increased risk of malnutrition. When people with HIV/AIDS who have depressed appetites, and an increased requirement for certain nutrients, including energy, are also poor and not able to afford a variety of nutritious foods, they can develop multiple-nutrient malnutrition.
Symptoms and signs of malnutrition
Severe primary malnutrition is characterised by the following symptoms:
Marasmus
pronounced weight loss with loss of muscle formation, particularly on the shoulders and buttocks
absence of fat under the skin
thin, papery skin hanging in folds
the skin may be darker, as if the child has sunburn
hair loss
a pinched, starved facial expression, which makes young children look old and wizen
infants appear apathetic and may lie still for long periods without moving or crying
Kwashiorkor
discoloured, fine, brittle hair that often has a copper sheen
skin rash or so-called “crazy-paving dermatitis”, where the skin is darker in patches with pale areas in between
oedema or water accumulation, making the infant appear “round and healthy”, but when pressure is applied to the skin it forms dents that take a long time to disappear
grossly swollen tummy
enlarged liver
apathy and listlessness
Stunting
The child may look normal until his or her weight and height are compared to figures in standard growth charts, or to other children of the same age who are not malnourished. It will be evident that the child is grossly underweight and undersized for his or her age. Some of the other signs and symptoms of marasmus or kwashiorkor may be present, e.g. thinning hair, skin rash, apathy.
In adults suffering from energy malnutrition, gross weight loss is the most common sign, although water retention, skin and hair changes, listlessness and apathy may also occur.
Vitamin and mineral malnutrition is characterised by individual signs and symptoms depending on the vitamin or mineral that is deficient; for example, iron deficiency produces anaemia, tiredness, listlessness, hair loss, etc. (Please refer to individual deficiency diseases in the A-Z of Diseases).
How is malnutrition diagnosed?
The doctor or clinic sister will weigh patients and measure their height and skin fold thickness for comparison with growth charts. If these simple procedures identify a child or adult who is grossly underweight or stunted, a full physical examination should be performed. The doctor or nurse will check for signs of water retention, changes in skin and hair, liver enlargement and abdominal swelling. The doctor will also take a blood sample and request a number of biochemical tests to identify protein, vitamin and mineral deficiencies.
Can malnutrition be prevented?
Protein-energy malnutrition can be prevented if the underlying causes of poverty, lack of food, education and hygiene can be eliminated. Even poor families can prevent malnutrition in their children by making sure that they eat the following regularly:
an unrefined staple food (unsifted maize meal, brown rice or brown bread, which have a much higher nutritive content than highly processed staples)
small quantities of protein-rich foods like eggs, meat or fish (keeping chickens or goats, or fishing, can provide protein-rich foods at low cost)
fresh, dried or sour milk (using skim milk powder or keeping goats or a cow)
fruits and vegetables (growing your own or bartering from neighbours)
some margarine or oil (soft margarine or sunflower oils are best).
Education plays an important role in ensuring that populations do not develop malnutrition. When funds are in short supply, it is essential that caregivers spend money on buying nutritious foods and do not waste it on alcohol, sweets, cold drinks or high-fat, high-salt snack foods. Education should also be used to help poor communities grow their own food and keep livestock.
Food aid programmes, if effectively implemented, can be used to help supply starving populations with essential foods to prevent malnutrition. The food aid that is pouring into refugee camps in Pakistan at the moment is an example of an international attempt to prevent mass malnutrition in Afghan refugees of all ages.
Anyone who is exposed to the risk of malnutrition because of sociological, medical or surgical conditions should be given supplements as a preventative measure. Elderly people living in frail care centres, for example, often have a combination of poor appetite linked to loss of taste or use of certain medications, difficulty with eating because of lack of teeth or poorly fitting dentures, poor absorption due to lack of stomach acid, and increased nutrient requirements cause by chronic diseases and use of medications. These people should be given liquid food supplements (such as Ensure or Complan or Buildup), plus complete vitamin and mineral supplements (a wide variety of such products are available at your local pharmacy - use liquid preparations if possible because they are absorbed more easily), before they develop malnutrition.
It has been suggested that if all persons over the age of 65 would drink one glass of liquid food supplement a day, malnutrition in the elderly could be effectively prevented, thus also preventing many of the illnesses older people suffer from. Unfortunately, this kind of intervention is seldom used.
How is malnutrition treated?
Infants and children suffering from acute malnutrition, kwashiorkor or marasmus are often hospitalised and given intravenous or tube feeding. Once the child has been stabilised, he or she is fed an energy and protein-rich diet together with a vitamin and mineral supplement to try to redress nutritional imbalances.
These infants and children often recover well while in hospital, only to be discharged and returned to their original poverty-stricken environment where they quickly deteriorate and become as malnourished as before. This underlines why poverty alleviation and nutrition education are so essential in preventing malnutrition.
People suffering from malnutrition associated with various medical conditions should receive dietetic counselling and/or food or vitamin and mineral supplements. For example, people who have had part of their duodenum (upper intestine) removed should be counselled by a dietician to ensure they eat a balanced diet that is easy to absorb and does not cause abdominal distress. They will also need to take a vitamin and mineral supplement and/or amino accid supplement to provide any essential nutrients they may no longer be able to absorb.
What is the outcome of malnutrition?
If acute, severe malnutrition is not treated in infants and children, they may die or be permanently physically and mentally stunted, thus never reaching their full potential. Chronic malnutrition also stunts physical and mental development.
Malnutrition involving one or more nutrients can have a variety of effects, most of which delay recovery and may result in additional complications. For example, if a person is not able to absorb fat-soluble vitamins because of removal of part of the intestine, then he or she may develop deficiencies of vitamins A, E, K and D. Prevention is essential and relatively easy to achieve by taking extra fat-soluble vitamin supplements.
When to call the doctor
The warning signs of malnutrition are:
loss of appetite
pronounced weight loss without dieting
failure to grow
listlessness and apathy
hair and skin changes
a swollen abdomen
gross water retention
If one or more of these symptoms occur, you or your child may be developing malnutrition and you should consult a doctor or take your child to your local clinic for a check-up.
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