Q.Differentiate between kwashiorkor and marasmus as forms of protein-energy malnutrition (PEM).

[!TLDR]

Kwashiorkor = protein deficiency with near-adequate calories, causing oedema/pot-belly; marasmus = deficiency of both calories and protein, causing severe wasting with no oedema.

[!ANSWER]

Kwashiorkor: protein-deficient diet, oedema present, pot-bellied appearance. Marasmus: calorie-AND-protein-deficient diet, no oedema, severe muscle/fat wasting.

Kwashiorkor and marasmus are both forms of protein-energy malnutrition but arise from distinct dietary deficiencies and present differently. Kwashiorkor results from a diet severely deficient in protein even when total calorie intake is near-adequate, typically appearing in young children shortly after weaning; its hallmark feature is oedema (fluid retention causing swelling of the face, limbs and abdomen, producing the characteristic pot-belly), along with retarded growth, thin discoloured hair, a fatty liver and lowered resistance to infection. Marasmus, by contrast, results from a severe deficiency of both calories and protein together (essentially general starvation), most often in infants under one year; it produces no oedema at all, but instead extreme wasting of muscle and subcutaneous fat, giving a shrunken, wizened appearance, along with severely retarded growth. The presence or absence of oedema is the single clearest distinguishing clinical sign between the two.

[!ANSWER]

Kwashiorkor: protein-deficient diet, oedema present, pot-bellied appearance. Marasmus: calorie-AND-protein-deficient diet, no oedema, severe muscle/fat wasting.

Contrast the two along two axes: what is deficient (protein only, vs both protein and calories) and whether oedema is present (yes for kwashiorkor, no for marasmus).

Treating kwashiorkor and marasmus as the same condition under two names, or forgetting that oedema is present in kwashiorkor but specifically absent in marasmus.