✔ 最佳答案
Kwashiorkor is caused by the lack of protein in diets in long term.
As a result, the concentration of some plasma protins (e.g. albumins which is improtent for maintaining the osmotic pressure of blood) decreases and, thus, the osmotic pressure of blood increases.
As the osmotic pressure of tissue fluid in abdominal cavity is unchange and the osmotic pressure of blood is higher than the tissue fluid in abdominal cavity, water cannot be reabsorbed into circulation. Thus, tissue fluid accumulates in the abdominal cavity and cuases swollen belly.
參考: base on my learning in Human Biology, and sorry for my poor English
