Plant-based nutrition for athletes: how to eat well and run for research

Atleta che mangia un pasto plant-based ricco di verdure fresche, pronto ad allenarsi per la ricerca oncologica.

General 04 Sep 2026

In short

Short answer: A plant-based diet is fully adequate for athletes at all levels, provided you carefully plan total energy intake, protein sources and at-risk micronutrients.

Key points:

Athletes require 1.2–2.0 g/kg of protein per day, regardless of diet type; plant-based athletes may need around 10% more due to the lower digestibility of plant proteins.
The optimal distribution is 20–30 g of protein per meal across 3–4 meals a day; tempeh (31 g/cup), seitan (21 g/4 oz) and tofu (20 g/cup) are among the most protein-dense sources.
There is no need to combine incomplete proteins in the same meal: variety throughout the day is sufficient.
The main risk is not protein deficiency but total energy deficiency: the "grazing" strategy (5–8 meals/snacks per day) is recommended for those who train intensely.
Vitamin B12, iron, omega-3 and vitamin D require specific attention in plant-based athletes.

Why it matters: For Strongers athletes who run to fund oncology research, well-designed plant-based nutrition is not a limitation but a sustainable, high-performance choice — backed by over 100 peer-reviewed studies.

Eating green to run stronger

If you're training for a half marathon, an Ironman or simply to feel better — and you're exploring a plant-based diet — the first question you're probably asking yourself is: will I have enough energy and protein to sustain my training? The answer, backed by decades of scientific research, is yes. As long as you do it right.

The go-to reference in the field, Plant-Based Sports Nutrition by D. Enette Larson-Meyer and Matt Ruscigno (Human Kinetics, 2020), is clear: a plant-based diet is fully adequate for athletes at all levels — from weekend runners to ultra-endurance competitors — provided the nutritional plan is designed with care.

How much protein do you actually need?

Let's start with the numbers, because numbers matter. The general RDA is 0.8 g of protein per kg of body weight per day. But if you train regularly, your requirement rises to 1.2–2.0 g/kg/day. This applies whether you eat meat or follow a vegan or vegetarian diet.

Plant-based athletes may need around 10% more protein than their omnivore counterparts, due to the lower digestibility of plant proteins. But this is no insurmountable obstacle: it's simply a variable to keep in mind when planning your meals.

The optimal distribution is 20–30 g of protein per meal, spread across 3–4 meals a day. An approach that is particularly useful for those over 50 — a demographic that is far from rare among our athletes Strongers.

The best plant-based protein sources

Let's bust a myth here: there's no need to combine "incomplete" proteins within the same meal. Varying your sources throughout the day is enough. Some foods already have a complete amino acid profile on their own:

Soy and derivatives: tofu, tempeh, edamame — tempeh, for example, provides 31 g of protein per cup
Quinoa: one of the few grains with a complete amino acid profile
Seitan: 21 g per 4 oz, great for those without gluten intolerance
Cooked legumes: 7–8 g per half cup — paired with rice or wholegrain bread, they make a perfect combo
Nuts and seeds: around 7 g per 2 tablespoons, great as a snack

Total energy: the real critical point

One of the most common mistakes among plant-based athletes isn't a protein deficiency, but a total energy deficiency. Plant-based diets tend to have greater volume and lower caloric density: you feel full sooner, but you're taking in fewer calories than you actually need.

The strategy recommended by the literature is the so-called "grazing" approach: 5–8 meals or snacks spread throughout the day to meet energy needs without having to sit down to enormous meals. Particularly useful in the week before a race or during periods of intense training.

Vegetarians and vegans also show a resting energy expenditure (REE) up to 11% higher than the general population, likely due to higher carbohydrate intake — a finding that further underscores the importance of carefully planning caloric intake.

Deficiencies to watch out for

A well-planned plant-based diet covers the vast majority of nutritional needs. However, there are some areas that require specific attention, especially for athletes:

Vitamin B12: practically absent in non-fortified plant foods — supplementation or fortified foods are essential
Iron: present in legumes and wholegrains, but in non-heme form, which is less bioavailable; pairing with vitamin C improves absorption
Omega-3: flaxseeds, walnuts and chia seeds provide ALA, but conversion to EPA/DHA is limited — an algae-based supplement is often recommended
Vitamin D and calcium: periodic monitoring with your doctor is the right move

Running plant-based, running for something

We at Strongers Social Club know well that every kilometre covered can become fuel for oncology research. Whether you're preparing for your first 10K or your fifth Ironman, choosing mindful nutrition — plant-based or otherwise — is part of the same commitment: taking care of yourself so you can take care of others.

Build your nutritional plan with data in hand, experiment with plant-based protein sources, and remember: every well-planned meal is one more step towards the finish line — yours and research's.