Beriberi is a deficiency of thiamine, more commonly known as vitamin B1.Your body needs thiamine to break down and digest the foods you eat, to keep your metabolism going, and help your muscles ...

Vitamin B1 deficiency is rare, and vitamin B2 deficiency is very rare, in the United States. This is because many foods, such as milk and whole grain cereals, are fortified with these vitamins.

This could help prevent drug-induced B1 deficiencies in future therapies. ... Severe B 1 deficiency symptoms can be caused not only by rare mutations, but also by some medications.