Vegan Nutrition: Getting It Right Without Guessing

The number of vegans in the UK has roughly quadrupled in the last decade. Veganuary breaks participation records every year. Plant-based products now occupy serious shelf space in every major supermarket. The cultural shift is real.

But here is the thing that gets lost in the enthusiasm: a vegan diet can be exceptionally healthy, or it can be nutritionally disastrous, and the difference comes down to a handful of specific nutrients that require deliberate attention.

An omnivore eating a lazy diet still accidentally gets B12 from meat, iron from red meat, calcium from dairy, and omega-3 from the occasional piece of fish. A vegan eating a lazy diet gets none of these by accident. They have to be intentional, or they will become deficient. Not might. Will.

This is not an argument against veganism. It is an argument for doing it properly.

The nutrients that need deliberate management

Vitamin B12

This is non-negotiable. There is no reliable plant source of vitamin B12. Nutritional yeast is fortified with it. Some plant milks are fortified with it. Marmite contains it. But none of these provide enough if you are relying on them inconsistently.

B12 deficiency causes fatigue, weakness, neurological problems (numbness, tingling, balance issues), and in severe cases, irreversible nerve damage. It can take years to become symptomatic because your liver stores B12, which means you can feel fine while your reserves are silently depleting.

Every major dietetic body in the world, including the British Dietetic Association, recommends that vegans take a B12 supplement. The dose should be at least 10mcg daily or 2,000mcg weekly. This is the single most important supplement for vegans. Do not skip it.

Iron

Plants contain non-haem iron, which is absorbed at roughly 2-20% efficiency compared to 15-35% for haem iron from animal sources. This does not mean vegans cannot get enough iron. It means they need to eat more iron-rich foods and pair them with vitamin C to improve absorption.

Good vegan iron sources: lentils, chickpeas, kidney beans, tofu, tempeh, quinoa, fortified cereals, dark leafy greens (spinach, kale, spring greens), pumpkin seeds, and dried apricots.

The vitamin C pairing is important. A squeeze of lemon on lentils, bell pepper in a bean chilli, orange juice alongside an iron-rich meal. Vitamin C can increase non-haem iron absorption by up to sixfold. Conversely, tea and coffee inhibit iron absorption, so avoid them within an hour of iron-rich meals.

Calcium

Without dairy, calcium needs conscious sourcing. The UK recommendation is 700mg per day.

Fortified plant milks (check the label, not all are fortified) typically provide 120mg per 100ml, matching cow's milk. Calcium-set tofu is an excellent source (roughly 350mg per 100g for calcium-set varieties, but check the label as not all tofu is calcium-set). Other sources: kale, pak choi, spring greens, fortified orange juice, almonds, sesame seeds (tahini), and dried figs.

The BDA notes that oxalates in spinach bind calcium and reduce absorption, so while spinach contains calcium on paper, very little of it is available to your body. Rely on the other sources listed above.

Omega-3 fatty acids

The same issue as with iron: plant omega-3 (ALA from flaxseed, chia seeds, walnuts, hemp seeds) converts poorly to the EPA and DHA your brain and cardiovascular system need. Conversion rates are roughly 5-10% for EPA and 2-5% for DHA.

If you are vegan and want adequate EPA and DHA, an algae-based omega-3 supplement is the most reliable approach. This is the same source that fish get their omega-3 from (fish accumulate it by eating algae-eating organisms), just without the fish as intermediary.

Iodine

Often overlooked. Dairy and fish are the main UK dietary sources of iodine. Vegans who do not consume seaweed or iodine-fortified foods are at significant risk of deficiency, which affects thyroid function. The BDA recommends vegans consider an iodine supplement of 150mcg daily. Some plant milks are now fortified with iodine (Alpro and Oatly have introduced iodine-fortified versions), but check the label rather than assuming.

Protein

Contrary to the persistent myth, getting enough protein on a vegan diet is entirely achievable. The challenge is not quantity but quality and distribution.

Plant proteins tend to be lower in one or more essential amino acids compared to animal proteins. Soya is the exception, providing a complete amino acid profile. For other plant proteins, the solution is variety: combine legumes with grains (beans on toast, lentil dal with rice, hummus with pitta) across the day to ensure you get all essential amino acids.

Aim for roughly 1.0-1.2g per kilogram of body weight if you are active, distributed across meals. Good sources: tofu, tempeh, edamame, lentils, chickpeas, black beans, quinoa, seitan, peanut butter, and soya milk.

The ultra-processed vegan trap

The explosion of vegan products in UK supermarkets has been largely positive for choice. But many of these products are ultra-processed and nutritionally poor.

A vegan sausage roll from the bakery section is still a pastry wrapped around processed protein with added fat, salt, and flavourings. Vegan cheese is often made from coconut oil and starch with minimal protein and negligible calcium. Many vegan ready meals are high in sodium and low in protein compared to their meat-based equivalents.

Being vegan does not automatically mean eating healthily. A diet of vegan crisps, vegan biscuits, vegan nuggets, and vegan ice cream is technically plant-based and nutritionally terrible.

The healthiest vegan diets are built around whole plant foods: vegetables, fruits, legumes, wholegrains, nuts, and seeds. Processed vegan products can be part of the diet (convenience matters), but they should not be the foundation.

How MyFoodFit scores for vegans

The vegan profile in MyFoodFit does two things that generic vegan product labels cannot.

First, it catches non-vegan ingredients that are not always obvious. Gelatin, casein, whey, honey, carmine (E120), shellac (E904), and vitamin D3 derived from lanolin are all animal-derived ingredients that can appear in products not marketed at vegans. The allergen and ingredient scanning engine flags these.

Second, it evaluates nutritional quality within the vegan context. A vegan product that is high in protein and fortified with B12 and calcium scores better than a vegan product that is nutritionally empty. The scoring does not just ask "is this vegan?" It asks "is this a good vegan food choice for your specific health profile?"

If you are vegan and also managing iron deficiency, the iron micronutrient modifier is boosted. If you are vegan and pregnant, the folate and iron modifiers both increase. If you are vegan and focused on gut health, the fermented food modifier rewards tempeh, miso, sauerkraut, and other fermented plant foods.

One scan. Vegan status confirmed. Nutritional quality scored. Health conditions accounted for. That is the point.

The practical framework

Supplement: B12 (essential), vitamin D (essential in the UK, October to March minimum), iodine (if not consuming iodine-fortified products regularly), and consider algae-based omega-3.

Build meals around protein sources: Tofu, tempeh, lentils, chickpeas, beans, edamame, quinoa, and soya products. If your meal does not contain one of these, it is probably too low in protein.

Eat calcium-rich foods daily: Fortified plant milk, calcium-set tofu, kale, pak choi, almonds, tahini.

Maximise iron absorption: Pair iron-rich foods with vitamin C. Avoid tea and coffee around iron-rich meals.

Eat the rainbow, literally. Diverse plant foods provide the range of micronutrients, polyphenols, and fibre types your body needs. The 30 plants per week target is particularly relevant for vegans because plant diversity is the foundation of the entire diet.

Veganism done well is one of the healthiest dietary patterns available. Veganism done carelessly creates deficiencies that can take years to manifest and months to correct. The difference is knowledge and a small amount of daily intentionality.

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This content is for information only and does not replace medical advice. If you are considering a vegan diet or are already vegan, discuss supplementation with your GP or a registered dietitian.