Kwashiorkor is a form of malnutrition that most often affects children in developing regions of the world where there is famine or a limited food supply.
The main sign of kwashiorkor is having too much fluid in body tissues, causing swelling under the skin (oedema). It usually begins in the legs, but can involve the whole body, including the face. The following symptoms can also be present:
red, inflamed patches of skin that darken and peel or split open
dry, sparse, brittle hair that may turn reddish yellow or white
drowsiness and tiredness
failure to grow
loss of muscle mass
an enlarged tummy ('pot belly')
regular or persistent infections
ridged or cracked nails
If the condition is left untreated for too long, it can be fatal.
Why does it happen?
Kwashiorkor is most commonly seen in developing regions of the world with an unstable food supply, particularly in countries where the diet consists mainly of corn, rice and beans which lack essential nutrients such as proteins, vitamins and minerals. However, the exact cause remains unknown.
The condition is unusual in developed countries such as the UK, although it can occasionally occur as a result of problems such as severe neglect, long-term (chronic) illness, a lack of knowledge about nutrition or a very restricted diet.
Kwashiorkor can affect people of all ages, but is more common in children than adults.
How it is diagnosed
Kwashiorkor can be diagnosed based on physical appearance and knowledge about the person's diet and care.
There are other conditions that may cause oedema and the other signs of kwashiorkor. Blood and urine tests may be done to exclude these and to see how kwashiorkor is affecting the body, including measuring blood sugar and protein levels, checking how well the liver and kidneys are working, checking for anaemia and measuring the levels of vitamins and minerals in the body.
Other tests may include growth measurements, calculating body mass index (BMI), measuring body water content, taking a skin biopsy and analysing a hair sample.
How it is treated
If it is identified early, kwashiorkor can sometimes be treated with either specially formulated milk-based feeds or ready-to-use therapeutic food (RUTF), which is typically made up of peanut butter, milk powder, sugar, vegetable oil and added vitamins and minerals.
In severe cases, or where there are already complications such as infections, more intensive treatment provided as an inpatient in a hospital or clinic will be needed.
Inpatient treatment will usually involve:
correcting or preventing low blood glucose
keeping the person warm, as kwashiorkor can cause difficulty generating body heat
treating dehydration if it is present with specially-formulated rehydration solution
treating infections with antibiotics, as kwashiorkor greatly increases the risk of infections
correcting vitamin and mineral deficiencies – vitamin supplements are usually included in the special milks or RUTF
slowly introducing small amounts of food at first because it may upset the body’s metabolism, before gradually increasing the strength and amount of food eaten to promote weight gain and growth
This whole process generally takes between two and six weeks to complete. Play and stimulation are an important part of recovery from kwashiorkor, as well as ensuring nutrition and care provided at home are adequate.
How well a person with kwashiorkor does after treatment depends on the severity of the condition when treatment began.
If treatment was started early, the person usually recovers well, although children may never reach their full growth potential.
If treatment was started in the later stages of malnutrition, the person may be left with physical and intellectual disabilities.
If kwashiorkor is not treated or treatment is delayed, it can result in death.
Children with kwashiorkor often develop an enlarged 'pot belly'
Marasmus is another type of malnutrition often found in developing regions of the world affected by an unstable food supply.
The condition is generally associated with a lack of protein, calories and other nutrients in the diet and, unlike kwashiorkor, it tends to lead to significant loss of fat and muscle without any associated swelling (oedema).
It's not clear exactly why some severely malnourished children develop marasmus and others develop kwashiorkor, although it is not thought to be solely due to diet because both conditions can occur in children with very similar diets.
Marasmus is generally treated in the same way as kwashiorkor.