Dante Carrillo
Vitamin B12 is a crucial nutrient for vegetarians and vegans to be mindful of in their diets. While meat and animal products naturally contain vitamin B12, plant-based foods do not, which can lead to a deficiency in those who follow vegetarian or vegan diets. This is particularly important for pregnant women or women of child-bearing age, as well as older adults, who are at a higher risk of B12 deficiency. To avoid adverse health effects such as nerve damage, depression, and an increased risk of heart disease, vegetarians and vegans should ensure they are getting enough vitamin B12 through fortified foods or supplements.
| Characteristics | Values |
|---|---|
| How long on a vegetarian diet until you need B12 | Vitamin B12 is not naturally found in unfortified plant-based foods. Vegetarians and vegans should ensure they include adequate amounts of vitamin B12 in their diet to avoid serious side effects like nerve damage and depression. |
| Recommended daily intake | 2.4 micrograms (mcg) for adults and children ages 14 years and older. |
| Sources of vitamin B12 for vegetarians | Dairy products, eggs, fortified foods such as cereals and nutritional yeast. |
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What You'll Learn
Fortified foods are a good source of B12 for vegetarians
Vitamin B12 is an essential nutrient that is not made by plants, and consequently, unfortified plant-based foods are not a reliable source. Plant foods do not provide a significant amount of vitamin B12, so it is vital that vegetarians find alternative sources to maintain good health. Fortified foods are a good alternative source of vitamin B12 for vegetarians.
Vegetarians, and especially vegans, are at a higher risk of vitamin B12 deficiency. This is because the vitamin is mainly found in meat, eggs, and dairy products. Fortified foods are a good way to increase vitamin B12 intake. Fortified foods are also typically easy for the body to digest, meaning the vitamin B12 is absorbed at a high rate.
Some good fortified food sources of vitamin B12 include fortified cereals, fortified plant-based milk, and nutritional yeast. Nutritional yeast is a species of yeast specifically grown for food, not as a leavening agent in bread and beer. It does not naturally contain vitamin B12, but the fortified version does, and it can be added to cooked meals or sprinkled on food and snacks. It also adds a depth of flavor to cooking, with a nutty or cheesy taste.
Research shows that eating fortified cereals daily helps increase vitamin B12 concentrations. One study showed that when participants ate 1 cup (240 mL) of fortified cereal containing 4.8 mcg (200% of the DV) of vitamin B12 daily for 14 weeks, their B12 levels increased significantly. It is important to choose a fortified cereal that is low in added sugar and high in fibre or whole grains.
Another study found that consuming nori, also called purple laver, increased levels of vitamin B12. The study recommends eating 5 grams of dried nori to improve levels.
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Vegetarians can eat dairy and eggs for B12
Vitamin B12 is an essential nutrient that is not made by plants, and consequently, unfortified plant-based foods are not a reliable source of B12. This means that vegetarians and vegans are at a higher risk of developing a vitamin B12 deficiency.
Vitamin B12 is mainly found in animal products, especially meat and dairy products. However, for those eating vegetarian diets, eggs and dairy are good sources of vitamin B12. Eating dairy products is one of the simplest ways to get enough vitamin B12 in a vegetarian diet. The body absorbs the vitamin B12 in milk and dairy products better than the vitamin B12 in beef, fish, or eggs. Two large eggs (100 grams) supply about 46% of the daily value (DV) for vitamin B12, plus 39% of the DV for vitamin B2. It is recommended to eat whole eggs instead of just the whites, as egg yolks have higher levels of vitamin B12 and it is easier to absorb.
Vegetarians can also get vitamin B12 from fortified foods, such as certain breakfast cereals and nutritional yeast. Fortified foods are a good option because they have high bioavailability, meaning the B12 is absorbed at a high rate, so very little is lost in the absorption process. Nutritional yeast is popular with vegetarians because it is easy to add to dishes while cooking and has a rich, cheesy, nutty flavor.
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Nori, or purple laver, can increase B12 levels
It is important for vegetarians and vegans to ensure they are getting enough vitamin B12 in their diet. Vitamin B12 is an essential nutrient that is not made by plants, so unfortified plant-based foods are not a reliable source of B12. This means that those on a plant-based diet are at a higher risk of vitamin B12 deficiency, which can cause serious side effects such as nerve damage and depression.
Nori, or purple laver, is a type of edible algae and sea vegetable that is commonly consumed in East Asian cultures. It has long been a controversial source of vitamin B12 for vegetarians, as some algae may contain inactive analogues that compete for absorption and impair vitamin B12 status. However, studies have shown that nori contains true vitamin B12 rather than analogues, and at a level that can easily achieve the recommended dietary allowance (RDA) of 2.4 µg. In fact, nori has been found to contain substantial amounts of biologically active vitamin B12 compounds (cyano-, hydroxo-, sulfito-, adenosyl- and methylcobalamin).
One study investigated the bioavailability of vitamin B12 from nori and evaluated the required dosage for improving vitamin B12 nutritional status in vegetarians not using supplements. Thirty vegetarians were assigned to either a control group (no nori), a low-dose group (5 g nori, providing 2.4 µg vitamin B12 per day), or a high-dose group (8 g nori, providing 4 µg vitamin B12 per day). The results showed that nori was effective in improving vitamin B12 status in vegetarians, with the high-dose group showing greater improvements than the low-dose group.
Another study by Takenaka et al. found that purple laver may be able to biosynthesize cobalamin from within, as even when it was cultured in a medium devoid of vitamin B12, it still contained substantial amounts of vitamin B12. This suggests that nori is a reliable source of vitamin B12 that can help vegetarians and vegans maintain adequate levels of this essential nutrient.
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B12 deficiency can cause nerve damage and depression
Vitamin B12 is an essential nutrient that is not made by plants and is therefore absent from unfortified plant-based foods. As a result, vegetarians and vegans are at a high risk of developing a vitamin B12 deficiency. This is particularly common among pregnant women or women of child-bearing age, who are increasingly shifting towards higher consumption of plant-based foods.
Vitamin B12 plays crucial metabolic roles across the life course, especially during pregnancy and in early development. A B12 deficiency can cause a range of symptoms, including nerve damage and depression.
Nerve Damage
Vitamin B12 is important for keeping nerve cells healthy. A deficiency can negatively impact motor and sensory nerve function, causing muscle cramps and weakness. It can also lead to impaired coordination, known as ataxia, and peripheral neuropathy. Vision disturbances may also occur due to damage to the optic nerve.
Depression
Low or deficient B12 levels may lead to depressive symptoms and other mental conditions, including psychosis and mood disorders. This may be caused by elevated levels of homocysteine, a sulfur-containing amino acid, which can increase oxidative stress, DNA damage, and cell death in the body.
It is important to note that the symptoms of a B12 deficiency can develop slowly and intensify over time. Early detection and treatment are crucial, as a serious deficiency can be corrected through weekly shots or daily high-dose B12 pills or multivitamins. For vegetarians and vegans, it is recommended to include fortified foods or supplements in the diet to ensure adequate B12 intake.
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Vegans are at risk of B12 deficiency and related health issues
Vegans are at risk of vitamin B12 deficiency due to its absence in unfortified plant-based foods. Vitamin B12 is an essential nutrient that plays crucial metabolic roles across the life course, particularly during pregnancy and early development. While a vegan diet is generally healthy and protective against heart disease, it can lead to adverse health effects if B12 intake is insufficient.
The only reliable vegan sources of B12 are fortified foods and supplements. Fortified foods include certain breakfast cereals, plant milks, soy products, and nutritional yeast. However, it is important to read labels carefully as some of these foods may not be fortified with B12. For those who are already deficient, supplements in the form of capsules or injections may be necessary.
Vegans who avoid common fortified foods, such as raw food vegans or macrobiotic vegans, are at a particularly high risk of B12 deficiency. Additionally, breastfed infants of vegan mothers with low B12 intake are also vulnerable. B12 deficiency can cause serious side effects, including nerve damage, peripheral neuropathy, anaemia, and depression. In infants, B12 deficiency can lead to loss of energy and appetite, failure to thrive, and in severe cases, coma or death.
Elevated homocysteine levels, which are associated with increased risk of heart disease, stroke, and pregnancy complications, have been observed in vegans and vegetarians with inadequate B12 intake. This highlights the importance of ensuring sufficient B12 levels, even in the context of a generally healthy vegan diet.
Doctors and health professionals emphasise the need for vegans to take the risks of B12 deficiency seriously. While most vegans maintain adequate B12 levels, studies have shown that their levels may still be lower than optimal, increasing the risk of related health issues. Therefore, it is crucial for vegans to be aware of reliable sources of B12 and to include them in their diet or consider supplementation under professional guidance.
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Frequently asked questions
Vitamin B12 is an essential nutrient that is not made by plants, so it is vital that vegetarians find alternative sources of vitamin B12 to remain in the best health. If you are concerned about your vitamin B12 levels, make sure you discuss ways to add B12 into your diet with your doctor.
Eating dairy products is one of the simplest ways to get enough vitamin B12 in a vegetarian diet. Another source of B12 for vegetarians is eggs. Fortified foods such as cereals, nutritional yeast, and plant milks are also good sources of vitamin B12 for vegetarians and vegans.
Without maintaining proper levels of vitamin B12, a person can suffer from serious side effects, including nerve damage, depression, and anemia. Strong evidence has been gathered that even slightly elevated homocysteine levels due to vitamin B12 deficiency increase the risk of heart disease, stroke, and pregnancy complications.
