Context: In 1896, Eugen Baumann observed iodine in thyroid glands. In 1897, Christiaan Eijkman worked with natives of Java, who also suffered from beriberi. Eijkman observed that chickens fed the native diet of white rice developed the symptoms of beriberi but remained healthy when fed unprocessed brown rice with the outer bran intact. Eijkman cured the natives by feeding them brown rice, discovering that food can cure disease. Over two decades later, nutritionists learned that the outer rice bran contains vitamin B1, also known as thiamine.

Question: What element can be found in thyroid glands?
Answer: iodine

Question: What group of natives suffered from beriberi?
Answer: Java

Question: Who worked with the natives to help solve their dietary issues?
Answer: Christiaan Eijkman

Question: What simple alternative food prevented the development of beriberi in chickens?
Answer: unprocessed brown rice with the outer bran intact

Question: How long after the natives were cured did it take for people to figure out the reason that brown rice cured them?
Answer: two decades