Noah Vinter
Pellagra is a systemic disease caused by a severe deficiency of niacin (vitamin B3). It is a form of malnutrition that can lead to death. Primary pellagra is caused by a lack of niacin in the diet, usually occurring in poor and food-limited populations. It is rare in industrialized nations but may be seen in individuals with alcoholism or other conditions that prevent the absorption or synthesis of niacin. Chronic alcoholism can lead to pellagra by causing organ damage and malnutrition, which, when combined with a diet low in niacin and tryptophan, can result in pellagra. Therefore, a deficiency of protein and niacin due to alcohol use can indeed cause pellagra.
| Characteristics | Values |
|---|---|
| Cause | Deficiency of niacin (vitamin B3) and/or its tryptophan precursor |
| Risk factors | Alcoholism, malnutrition, anorexia nervosa, extreme diets, gastrointestinal disorders, chronic diarrhoea, inflammatory bowel disease, cirrhosis of the liver, Hartnup disease, carcinoid syndrome, certain medications |
| Treatment | Niacin supplements, nutritional education, food access, sun protection |
| Prevention | Fortified food products, supplements, education, resources |
| Occurrence | Rare in industrialised nations, common in developing countries, especially where corn is a major food source |
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What You'll Learn
Pellagra is caused by a severe deficiency of niacin (vitamin B3)
Pellagra is a systemic disease caused by a severe deficiency of niacin, also known as vitamin B3. It affects the entire body and, if left untreated, can lead to nerve damage, particularly in the brain, and eventually, death.
Niacin is crucial to cell functioning throughout the body. Niacin is found in many animal products (as nicotinamide) and plants (as nicotinic acid). A varied diet that includes milk, eggs, red meat, poultry, fish, peanuts, legumes, and seeds provides sufficient niacin. Niacin is also synthesised in the body from the amino acid tryptophan, which is found in meat, poultry, fish, eggs, and peanuts.
Primary pellagra is caused by a lack of niacin in the diet and is common in developing countries where corn is a staple food. Although corn is rich in niacin, it is in a bound form that the body cannot access unless the corn is treated with an alkaline solution. In addition, the proteins in corn are low in tryptophan. As a result, consuming untreated corn as a primary food source can lead to pellagra. Pellagra was once endemic in the poorer states of the US South, where it was known as "spring sickness".
Secondary pellagra occurs when the body is unable to absorb niacin from food. This can be due to various health conditions, such as gastrointestinal diseases that cause malabsorption, or certain medications that interfere with niacin synthesis. Alcohol use disorder is a common cause of secondary pellagra, as heavy alcohol consumption can damage organs, leading to malabsorption and malnutrition.
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Niacin is found in animal products and plants
Pellagra is a disease caused by a severe deficiency of niacin, also known as vitamin B3. It can be caused by inadequate dietary intake, which is often the case in impoverished and food-limited populations. In developed countries, niacin deficiency is more likely to occur from secondary causes, such as health conditions or substances that prevent the body from absorbing or using niacin.
Niacin is found in both animal products and plants. Animal sources of niacin include meat, fish, and poultry. Liver, anchovies, and pork are particularly good sources of niacin. Eggs are another animal product that contains niacin.
When it comes to plant-based sources of niacin, there are also several options. Avocado, whole grains, mushrooms, and fortified grains are all good sources of niacin. Brown rice and whole-wheat products, such as whole-wheat bread and pasta, also contain niacin. However, it's worth noting that the niacin in grains may be less absorbable by the body compared to other food sources.
By including a variety of these niacin-rich foods in their diet, individuals can help prevent niacin deficiency and the associated condition of pellagra.
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Niacin deficiency is preventable with a diet rich in protein
Pellagra is a disease caused by a severe deficiency of niacin (vitamin B3). It is a form of malnutrition, specifically, micronutrient undernutrition. Niacin is crucial for maintaining cell function. It is a component of nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP), which are required by over 100 enzymes involved in the metabolism of carbohydrates, fats, proteins, and alcohol, as well as DNA repair and cell signalling.
Niacin deficiency can be prevented with a diet rich in protein. Nutritional education and food access are crucial to prevention. A well-balanced diet that includes a variety of foods such as milk, eggs, red meat, poultry, fish, peanuts, legumes, seeds, whole or enriched grains, and green leafy vegetables can provide sufficient niacin and tryptophan. Tryptophan is an essential amino acid found in meat, poultry, fish, eggs, and peanuts, which the body uses to synthesise niacin.
In certain parts of the world, such as Africa, India, China, and some developing countries, pellagra is still endemic due to limited food sources and a high consumption of untreated corn as a staple food. Corn is a poor source of tryptophan, and the niacin in corn is bound up in a complex form that is not easily accessible to the body unless treated with an alkaline solution. However, in developed countries, pellagra is rare due to the fortification of foods such as bread and cereal with niacin. Additionally, in Mesoamerican cultures, a process called nixtamalization, which involves pre-processing corn by soaking it in an alkaline solution, has been effective in preventing pellagra.
While primary pellagra is caused by a lack of niacin in the diet, secondary pellagra occurs when the body is unable to absorb niacin due to certain health conditions, including gastrointestinal diseases, inflammatory bowel disease, cirrhosis of the liver, chronic diarrhoea, and gastric bypass surgery. Alcohol use disorder is also a significant contributor to pellagra, as heavy alcohol consumption can induce organ damage, leading to malabsorption and general malnutrition. Therefore, it is important to address underlying health issues and seek medical care if there are any digestive issues or symptoms of niacin deficiency.
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Alcohol use disorder can induce pellagra by causing organ damage
Alcohol use disorder (AUD) is a common medical condition where individuals cannot stop drinking, even when drinking negatively affects their health, safety, and personal relationships. AUD can cause organ damage, especially to the liver, pancreas, and peripheral nervous system. This damage can induce pellagra by impairing the absorption and metabolism of niacin (vitamin B3).
Pellagra is a systemic disease caused by a severe deficiency of niacin. It is rare in industrialized nations and typically occurs in impoverished and food-limited populations. Pellagra affects the entire body and can lead to death if untreated. Symptoms include mental confusion, glossitis, alopecia, dermatitis, sensitivity to sunlight, an enlarged heart, peripheral neuritis, and dementia.
Niacin is crucial for cell functioning, and its deficiency can manifest in the skin, mouth, bowels, and brain. The body uses niacin to convert food calories into energy through the coenzyme nicotinamide adenine dinucleotide (NAD). NAD works with enzymes to catalyze chemical reactions, helping transfer potential energy from macronutrients into usable cellular energy.
Alcohol misuse can lead to organ damage and malnutrition, both of which are risk factors for pellagra. Heavy drinking takes a toll on the liver, causing various inflammations and problems. Alcohol misuse is also linked to pancreatitis, a dangerous inflammation of the pancreas that can affect hormone regulation and digestive enzyme production. Additionally, AUD is associated with peripheral neuropathy, which can cause numbness in the arms and legs, painful burning in the feet, heart arrhythmias, and orthostatic hypotension.
The mechanism by which alcohol-induced organ damage causes pellagra is twofold. Firstly, organ damage, particularly to the liver and pancreas, can impair the absorption and metabolism of niacin. Secondly, alcohol use disorder can contribute to malnutrition, as seen in individuals with anorexia nervosa or kwashiorkor, further exacerbating niacin deficiency. Therefore, the combination of organ damage and malnutrition due to alcohol use disorder can induce pellagra.
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Pellagra is treated with niacin supplements
Pellagra is a systemic disease caused by a severe deficiency of niacin (vitamin B3). It is characterised by the 4 Ds: dermatitis, diarrhoea, dementia and, if untreated, death. The disease affects the whole body and can eventually lead to death. It is usually caused by poor diet, but sometimes by a secondary condition.
Pellagra can be treated with niacin supplements. When food choices are limited, enriched foods and dietary supplements can help. A B-complex vitamin supplement provides enough niacin for most healthy adults. The recommended daily dose of niacin is about 15 milligrams. Niacin supplements are also recommended for patients taking long-term medications known to cause pellagra, such as isoniazid and ethionamide. The WHO recommends at least 300 mg of nicotinamide in an oral divided daily dose for 3–4 weeks to treat pellagra. Nicotinamide is recommended due to niacin-induced flushing.
With supplements, most people begin to improve in a few days. Gastrointestinal symptoms are the first to heal, usually within the first week. Skin and mouth sores begin to heal within two weeks. Some advanced cases may take longer to heal. Going forward, healthcare providers recommend maintaining a balanced diet to prevent primary pellagra. Niacin deficiency often occurs with other micronutrient deficiencies. These can all be improved with an adequate diet. Some people may need nutritional education or additional support.
Secondary pellagra can be harder to treat. Although supplements often help, they may not be enough if the body is unable to metabolise niacin effectively. Recovery in these cases depends on isolating and treating the underlying condition that is causing pellagra. This can be a long process, depending on the condition.
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Frequently asked questions
Pellagra is a disease caused by a severe deficiency of niacin (vitamin B3).
Symptoms of Pellagra include mental confusion, glossitis, alopecia, dermatitis, sensitivity to sunlight, enlarged heart, peripheral neuritis, and dementia.
Pellagra can be caused by a diet that is deficient in niacin and tryptophan, or by health conditions that prevent the body from absorbing or using niacin.
Pellagra is treated by increasing the body's niacin levels through supplements and a well-balanced diet.
Alcohol use disorder can induce Pellagra by causing organ damage, malabsorption, and general malnutrition. Alcoholism is the most common cause of Pellagra in developed countries.
