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Vitamin B1, also known as Thiamine, is one of the 8 essential B vitamins that help the body convert food (carbohydrates, fat, and protein) into energy.

The main role of the B1 vitamin is to create energy from carbohydrates.

It was named B1 because it was the first B vitamin found within the body.

In the body, particularly high concentrations of Thiamine are found in skeletal muscles and in the heart, liver, kidney, and brain(1). Vitamin B1 is very important for the brain that uses it in glucose metabolism. (2)

If your diet is rich in simple carbs, you will need to consume more of this vitamin.

Thiamine plays a vital role in the metabolism of glucose.
Thus, the emphasis is placed on the fact that ingestion of excessive simple carbohydrates automatically increases the need for this vitamin.

This is referred to as high-calorie malnutrition (3)

Coffee, black tea, and cola contain caffeine that may deplete vitamin B1.

Caffeine has a mild diuretic effect, which increases urination. Water-soluble vitamins, such as the B-vitamins, can be depleted as a result of the fluid loss.
In addition, it interferes with the metabolism of some B-vitamins, such as Thiamine. (4)

Chemicals in coffee and tea called tannins can react with Thiamine, converting it to a form that is difficult for the body to take in. This could lead to Thiamine deficiency.

Interestingly, Thiamine deficiency has been found in a group of people in rural Thailand who drink large amounts of tea (>1 litre per day) or chew fermented tea leaves long-term.
However, this effect hasn’t been found in Western populations, despite regular tea use.
Researchers think the interaction between coffee and tea and Thiamine may not be important unless the diet is low in Thiamine or vitamin C.
Vitamin C seems to prevent the interaction between Thiamine and the tannins in coffee and tea. (5)

Because thiamin can only be stored in the body for a short time before it is readily excreted, a regular dietary intake of thiamin is necessary to maintain the proper blood levels.

Food sources of Thiamine

Whole-grains, nutritional yeast, brown rice, chickpea, lentils, soybeans, nuts, dried beans, peas, red meat.

Nearly all living tissues contain thiamine and some thiamine is therefore derived from
almost all articles consumed as food.
It is only with refined cereals ie. white flour, white rice,
degerminated maize meal, cereal starches, cassava and sago, as well as in products made from
them, that the thiamine content is too low. (6)

First signs of deficiency are exhaustion, fatigue, nervousness, irritability, lack of concentration, memory problems, reduced tolerance to pain, lack of appetite and sleeping problems.

When the luck of this b1 vitamin is for a long period of time, beriberi disease can be developed

Beriberi was a particularly problematic disease in countries that depended very heavily on the intake of rice and who began to polish the outer layers off of the rice prior to cooking.
Since B1 was contained in these outer layers, they were polishing off the B1 as well.

Beriberi characterized by impairment of the nerves and heart.

General symptoms include loss of appetite and overall exhaustion, digestive irregularities, and a feeling of numbness and weakness in the limbs and extremities. is rapidly fatal unless specific therapy is given.

Vitamin B1 and mosquito bites

There are some claims that B1 can protect you from mosquito bites, but the research does not confirm these claims.


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