Beriberi (pronounced Berry-berry) is a nervous system ailment caused by thiamine (vitamin B1) deficiency. Thiamine is involved in the breakdown of energy molecules such as glucose. It is also found on the membranes of neurons. Symptoms of Beriberi include severe lethargy and fatigue, together with complications affecting the cardiovascular, nervous, muscular, and gastrointestinal systems.
The origin of the word is from a Sinhalese
phrase meaning "I cannot, I cannot", the word being doubled for emphasis.
Beriberi is caused by a lack of thiamine
). Thiamine occurs naturally in unrefined cereals
and fresh foods, particularly whole grain bread
, fresh meat
, green vegetables
, and milk
. Beriberi is therefore common in people whose diet
excludes these particular types of nutrition.
Beriberi may be found in people whose diet consists mainly of polished white rice, which is very low in thiamine because the thiamine-bearing husk has been removed. It can also be seen in chronic alcoholics with an inadequate diet (Wernicke-Korsakoff syndrome), as well as being a rare side effect of gastric bypass surgery. If a baby is mainly fed on the milk of a mother who suffers from thiamine deficiency then that child may develop beriberi as well.
The disease was often found in Asian countries (especially in the 19th century and before), due to those countries' reliance on white rice as a staple food.
Symptoms and effects
include weight loss, emotional
disturbances, impaired sensory perception
in the limbs, and periods of irregular heart rate
(swelling of bodily
tissues) is common. In advanced cases, the disease
may cause heart failure
It may also increase the amount of lactic acid
and pyruvic acid
within the blood.
- Wet beriberi affects the heart; it is sometimes fatal, as it causes a combination of heart failure and weakening of the capillary walls, which causes the peripheral tissues to become edematous.
- Dry beriberi causes wasting and partial paralysis resulting from damaged peripheral nerves. It is also referred to as endemic neuritis.
Treatment for beriberi is with thiamine hydrochloride
, either in tablet form or injection. A rapid and dramatic recovery within hours can be made when this is administered to patients, and their health can be improved within an hour of starting treatment. In emergency situations where concentrated thiamine supplements are unavailable, feeding the patient with a thiamine-rich diet (e.g. whole grain
brown bread) will lead to recovery, though at a much slower rate. Additionally, administering glucose will provide the patient with a temporary boost, while their body recovers.
where polished white rice
was the common staple food of the middle class, beriberi resulting from lack of vitamin B was endemic. In 1884, Takaki Kanehiro
, a British-trained Japanese medical doctor of the Japanese Navy
observed that beriberi was endemic among low ranking crew who often ate nothing but rice but not among crews of Western navies and officers who were entitled to a Western-style diet. Kanehiro initially believed that lack of protein was the chief cause of beriberi. With the support of Japanese navy, he experimented using crews of two battleships
, one crew was fed only white rice, while the other was fed a diet of meat, fish, barley, rice, and beans. The group that ate only white rice documented 161 crew with beriberi and 25 deaths, while the latter group had only 14 cases of beriberi and no deaths. This convinced Kanehiro and the Japanese Navy that diet was the cause of beriberi. This was confirmed in 1897, when Christiaan Eijkman
discovered that feeding unpolished rice
instead of the polished variety to chickens helped to prevent beriberi in the chickens. The following year, Frederick Hopkins
postulated that some foods contained "accessory factors"—in addition to proteins, carbohydrates, fats, etcetera—that were necessary for the functions of the human body.
Christiaan Eijkman, a Dutch physician and pathologist, demonstrated that beriberi is caused by poor diet. His work led to the discovery of vitamins. Together with Sir Frederick Hopkins, he was awarded the 1929 Nobel Prize for Physiology or Medicine for the discovery.
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