1. Kwashiorkor
All parts of the body are boney and skinny. But the lower abdomen is distended and the liver swells.
2. Marasmus
Muscle and flesh are nearly all gone. Even the fat insulation layers that everyone has on some parts of the body, like the butt. The lower abdomen becomes bigger. A bit like kwashorkor, though different.
3. Cachexia
Also like Marasmus but not that bad.
When a person starts to get less nutrition or their diet is not balanced resulting in deficiency of a certain mineral group, catablism may start. Catabolism is the breaking down of muscle for use to sustain life. When that happens, the either of the 3 diseases above may start. The person may also get lethargy - feeling week and tired...