A well-planned vegan diet can be genuinely healthy, rich in fibre, and full of variety. What it does require is a little attention to a handful of nutrients that are harder to obtain from plants alone. Rather than worry, it helps to know which ones to keep an eye on — and a blood test now and then is a straightforward way to make sure your diet is working for you.
Why plant-based diets need some planning
Certain nutrients are found mainly in animal foods, or are absorbed less efficiently from plant sources. That does not make a vegan diet inadequate; it simply means these nutrients deserve conscious thought through food choices, fortified products or, where appropriate, supplements. Testing helps you see how your own diet is performing rather than relying on assumptions.
The key nutrients to watch
A few stand out as worth monitoring on a fully plant-based diet:
- Vitamin B12 — found almost exclusively in animal foods, so vegans typically rely on fortified foods or a supplement. This is the single most important one to keep an eye on.
- Iron (and ferritin) — plant iron is absorbed less readily than the iron in meat, so stores can drift low over time, particularly in menstruating women.
- Vitamin D — hard to get from diet for anyone in the UK, and worth checking especially in the darker months.
- Zinc — present in plants but less well absorbed, so intake and status are worth considering.
- Folate — usually plentiful on a plant-rich diet, but useful to confirm alongside B12.
- Magnesium and other minerals — generally well supplied by whole plant foods, but included in a broad screen for completeness.
Why a combined screen makes sense
Testing these nutrients one at a time is inefficient and often means repeat blood draws. A vitamin and mineral screen checks the common gaps together, giving you a clear snapshot from a single appointment. That makes it easier to see the whole picture and to spot whether one modest shortfall is quietly developing before it causes symptoms.
Screen key nutrients
A vitamin and mineral screen covering the common gaps.
Book a vitamin & mineral screenWhat to do with the results
If everything sits comfortably in range, that is reassuring confirmation your diet is working. If something is low, it points to a specific, fixable area rather than a reason to abandon a plant-based approach. Any decisions about supplements or dietary changes are best made with a clinician or a registered dietitian, who can tailor advice to your results and circumstances.
How often to check
There is no single rule, but many people find an annual check sensible, with an earlier test if they develop symptoms such as unusual tiredness, or if they have recently changed their diet. New vegans in particular may find it reassuring to establish a baseline in the first year and track it from there.
Screen key nutrients
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Specialist interest: Cardiovascular Medicine · OneMedicine, CQC-registered clinic