Under-nourishment, also known as malnutrition, refers to the condition of not receiving adequate nutrition for one's body to function properly. Some synonyms for under-nourishment include starvation, hunger, famine, deficiency, and deprivation. These words describe the extreme effects of under-nourishment, where a person may go without food for extended periods of time, leading to a significant loss of weight and possible health complications. Additionally, words like inadequacy, insufficiency, and deficiency may be used to describe a less severe case of under-nourishment, where a person is not receiving enough nutrients for their body's needs but can still function. Regardless of the terminology used, under-nourishment is a significant public health concern that affects millions of people worldwide.