What vitamin deficiency is associated with loss of appetite and beriberi?

The vitamin deficiency associated with loss of appetite and beriberi is indeed Vitamin B1, also known as thiamine. Thiamine plays a crucial role in carbohydrate metabolism and the normal functioning of the nervous system. When there is a deficiency of Vitamin B1, the body cannot convert carbohydrates into energy effectively, which can lead to various symptoms, including a loss of appetite, fatigue, and neurological issues.

Beriberi is a disease that results from severe thiamine deficiency and manifests in two main forms: wet beriberi, which affects the cardiovascular system, and dry beriberi, which primarily affects the nervous system. Both forms can lead to significant health problems, highlighting the importance of adequate thiamine intake in one's diet. This is particularly relevant in populations where polished rice is a staple food, as it is low in thiamine compared to whole grains.