Many elderly people in poor areas suffer from malnourishment and become physically weak.

malnourishment 是由前缀 mal-（表示"坏的、不良的"）和名词 nourishment（营养）组成的复合名词。mal- 表示负面含义，nourishment 来自动词 nourish（滋养、养育）。malnourishment 指"营养不良的状态"，即身体因长期缺乏足够营养而导致的健康状况不佳。