Earth First

Plant-Based Diet: Vitamin B12 Sources

Plant-based diets have increased considerably around the world in the last few years. While consuming a plant-based diet has been linked to health benefits, it is important to be aware of potential nutritional deficits which could lead to health conditions. Learn why vitamin B12 is so important, and how to get enough of it on a plant-based diet.

What is vitamin B12 and why is it so important?

Vitamin B12 is an essential micronutrient. We must obtain it from our diet because we cannot autonomously produce B12 in our body without consuming it from an external source. No animal can live without vitamin B12, and B12 shortages can have serious consequences in humans.

B12 is essential for the synthesis of DNA, the lack of B12 can damage the nervous system and cause cognitive issues like confusion, poor memory and in more severe cases, dementia.1,2,3,4 While there is a lag time before the B12 deficiency symptoms appear, they may not be reversible.1,2

Vitamin B12 deficiency in plant-based diets

While plant-based diets have been linked to lower prevalence of diabetes, obesity, cancer and other cardiovascular diseases, several studies have shown that vitamin B12 is a common deficiency among those following a plant-based diet.1,2,3,4

So why is there a higher risk of vitamin B12 deficiency when following a plant-based diet? There is one simple answer: This vitamin is only naturally available in animal-derived foods or products. Though, it may be interesting to point out that vitamin B12 is produced by bacteria and archaeon-not animals.

How B12 is naturally produced

Animals acquire vitamin B12 through the microbial interaction in their stomachs. Animal stomach contains various microorganisms including B12-synthesizing bacteria. The B12 produced is absorbed in the intestine and stored in the liver and muscles of the animals, or secreted into their milk. Other animals may also pass B12 to their eggs, making meat, milk, and eggs good sources of vitamin B12.5

In aquatic environments, most phytoplankton also acquire vitamin B12 through interactions with bacteria. Phytoplankton are then eaten by fish and bivalves, making fish and shellfish other sources of B12.5 Additionally, livestock animals are often supplemented with vitamin B12 in their feed to boost their B12 content.

How to get enough B12 on a plant-based diet

Vegetarians who eat milk and eggs have less chance of becoming B12 deficient. As milk and eggs are sources of this vitamin, they should increase the amount of these foods in their diet to avoid a shortfall, as 1 cup of milk and 1 egg per day only provides about two-thirds of the daily recommendation.3

For plant-based eaters, there are some tricks that can be followed to lower or stop the risk of becoming B12 deficient:

1. Consume more plant-based foods that are fortified with B12, like breakfast cereals and plant-based drinks.

However, there is no scientific evidence that fortification on its own is enough to meet your daily needs. Several studies have shown that the risk of deficiency is higher for plant-based eaters who don’t take B12 supplements.2 Therefore, vitamin B12 supplements are helpful to avoid deficiencies and its health consequences.

2. Take B12 Supplements

There are many types of supplement such as multivitamins, sublingual forms (which are dissolved under the tongue), or even prescribed B12 shots in extreme circumstances, though this is usually used as a treatment for B12 shortage rather than as a preventive method. Additionally, B12 supplements are also available as a prescription medication in a nasal gel form that is sprayed into the nose.6

While vitamin B12 is one of the most important deficiencies, there are other vitamins and minerals deficiencies to be aware of when following a plant-based diet, including vitamin D, iron, zinc and omega-3 fatty acids.1 So if you’re vegan or vegetarian, it’s recommended that you plan your diet accordingly to include all the necessary nutrients to avoid any deficiencies and their associated risks.

How do you get enough B12 in your plant-based diet?

Related articles

Most viewed

Earth First

Food Fraud | When Does Food Become Criminal?

Luke Cridland

The modern consumer wants to know about the food they’re buying - is it organic, is it vegan,…

Earth First

Fungi in Sustainable Food Production

Anne Reshetnyak

Fungi are not just fun to forage and delicious to eat, they can also be useful for food…

Earth First

COVID-19 | Impacts On Food Waste

Madhura Rao,Dr Alie de Boer

Food supply chains are complex systems with carefully orchestrated operations spread across the…

Human Stories

Who Pays the Price of Food Inflation?

Aran Shaunak

I don’t need to tell you that we’re in the midst of a cost-of-living crisis. The food…

Earth First

What Will We See in Farms of the Future?

Claudia Lee

With agriculture accounting for almost one third of global greenhouse gas emissions, the impacts of…

Earth First

Do Plant-based Diets Provide Enough Protein?

Klaus Hadwiger,Angelika Schulz

We've all heard the argument that plant-based diets don't provide us with enough protein - but is it…

Earth First

Quinoa | A Climate Proof Food

Merel Deelder

Due to the effects of climate change, producing enough food for our growing world population is…

Human Stories

Cocoa, Coffee, and Cocaine: A Bitter-Sweet Future for Farmers in Colombia

Sunny Chen

Coca, once used in the original Coca-Cola recipe in 1886, has impacted Colombia since the industry…

Earth First

What Does Jackfruit Taste Like & How Do You Eat It?

Madhura Rao

Jackfruit can be enjoyed as a dessert, in a curry, mixed with barbecue sauce, and in so many other…

Earth First

Rice in Asia | How it’s Grown

Samanta Oon

"I cannot live without rice"; my mum has said this to me more than once. Perhaps that's a tad…

Earth First

Seed Banks - Safeguarding Biodiversity | A Photo-Essay

Eloise Adler

Take a look inside the seed banks protecting the world’s biodiversity and safeguarding our future.

Earth First

The EU’s Farm to Fork Strategy: Is The Pesticide Reduction Target Still Realistic?

Claudia Lee

In May 2020, the European Union launched the ‘Farm to Fork Strategy’ as part of the EU Green…

Keep updated with the latest news about your food with our newsletter

Follow Us