n.糙皮病，玉米红斑病(因缺乏营养而引起的皮肤皲裂，可导致精神障碍)

Pellagra is a disease caused by a deficiency of niacin (vitamin B3) in the diet.
瘧病是由饮食中缺乏烟酸（维生素B3）引起的一种疾病。
Symptoms of pellagra include dermatitis, diarrhea, and dementia.
瘧病的症状包括皮炎、腹泻和痴呆。
Pellagra can be prevented by consuming foods rich in niacin, such as meat, fish, and whole grains.
通过食用富含烟酸的食物，如肉类、鱼类和全谷物，可以预防糙皮病。
In the early 20th century, pellagra was a major public health problem in the southern United States.
在20世纪初，糙皮病是美国南部的一个主要公共卫生问题。
Pellagra is also known as "three Ds" disease because of its symptoms: dermatitis, diarrhea, and dementia.
瘧病也被称为“三D”疾病，因为它有皮炎、腹泻和痴呆等症状。
Pellagra is more common in developing countries where people's diets are primarily based on corn.
在以玉米为主食的发展中国家，糙皮病更为常见。
Treatment for pellagra involves taking niacin supplements and improving one's diet.
治疗糙皮病的方法包括服用烟酸补充剂和改善饮食。
Pellagra can lead to severe malnutrition if left untreated.
如果未经治疗，糙皮病可能导致严重的营养不良。
The discovery of niacin as a cure for pellagra was a major breakthrough in medical science.
发现烟酸作为糙皮病的治疗方法是医学科学的一个重大突破。
People with certain genetic disorders, such as Hartnup disease, may be at increased risk for developing pellagra.
患有某些遗传性疾病（如哈特努普病）的人可能更容易患糙皮病。