7 essential nutrients vegans often lack - and how to get enough of them

Considering going vegan for Veganuary? Make sure you’re aware of the potential nutrient deficits, and learn how to top them up from alternative sources

Veganuary: 7 important nutrients lacking in a vegan diet
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Veganism has never been hotter. A record 400,000 people worldwide signed up to the Veganuary movement in January 2020 - with even more expected to take part this year.

Motivating factors that drive people to embark on a plant-based, animal-product-free diet include reducing the demands placed on the planet by meat production and an all-round healthier approach to eating.

However, before you dive headfirst into one of the best vegan cook books this Veganuary, it’s important to be aware of the potential pitfalls of a plant-based diet - one of which is a reduced intake of certain nutrients that are essential for good health.

Without animal foods, vegans can be missing a source of iron, vitamin B12 and selenium, while calcium, omega-3 fatty acids and iodine are most abundant in dairy products and oily fish. Below we’ve outlined these in more detail, giving advice on how you can ensure you can get enough of them by alternative means. 

And, as with any major change to your diet, it’s worth consulting a doctor before embarking on Veganuary. 


Omega-3s protect you from heart disease and support your brain function and vision. The richest source of the omega-3 fatty acid, called docosahexaenoic acid (DHA) is oily fish like salmon or mackerel. Whilst you can get another type of omega-3 fatty acid from vegan foods like nuts and seeds these are short chain fatty acids and not as beneficial as DHA. Look for supplements sourced from algae, such as Vegetology Opti 3 - which makes it onto our list of the best fish oil supplements.


Calcium is vital for bone and dental health but also for the nervous system and muscle development. By far the richest source of calcium is milk and dairy foods so make sure that your alternative choice - be it soya, oat, almond or rice milk - is fortified with calcium. Other vegan-friendly calcium sources include kale, rocket and watercress.

Vitamin B12

Studies confirm low vitamin B12 blood concentrations in vegetarians and especially in vegans. The Vegan Society recommends a B12 supplement (a good vegan option is Viridian Woman 40+ Multi, which features on our list of the best vitamins for women over 50) or eating two to three portions of B12-fortified foods a day, such as fortified breakfast cereals and some dairy alternatives to milk or spreads. 


Iron is essential for a healthy blood supply, brain function and your immunity. If you’re vegan, ensure you eat some iron-containing food at most sittings and snacks, along with some food or drink containing vitamin C, which helps your absorption of iron (not tea or coffee, which have the opposite effect). Vegan iron sources include legumes, tofu, nuts, seeds, dried fruits, quinoa and amaranth.


Iodine helps your thyroid gland to work properly, which has a direct impact on your metabolic rate and the overall health of your body cells. It’s found in milk, eggs, fish and shellfish and it’s very difficult to know how much iodine you’re getting from plant foods alone. If you rely on supplements to maintain your iodine levels make sure you take no more than 0.5mg/day, as higher levels than this can be harmful to your thyroid. 

Healthy eating kitchen essentials:


An important antioxidant which protects your body cells and supports your immunity. Plant-based foods containing selenium include nuts, especially Brazil nuts and cashews, and some seeded and wheatgerm breads. Some cereals also contain selenium, such as puffed wheat cereals, cornflakes and Shredded Wheat.


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