What "plant-based" means in sport
Eating plant-based is a spectrum, not a single label. It ranges from the vegetarian, who excludes meat but may consume eggs and dairy, to the vegan, who uses no animal products at all. In between there are athletes who simply prioritize plants and reduce meat. The central point for performance is not the label, but whether the diet delivers enough energy, protein and micronutrients to train and recover.
The question that interests the athlete is simple: does removing meat hurt performance? The most recent evidence indicates that, when well structured, a plant-based diet does not compromise performance, and in some aerobic markers it may even favor it.
What the evidence shows about performance
A systematic review with meta-analysis published in the British Journal of Nutrition concluded that plant-based diets benefit aerobic performance and do not compromise strength and power, when energy and protein needs are met. In other words, the decisive factor is planning, not the origin of the food.
On the endurance side, physically active vegan women showed a slightly higher relative maximal VO2 than omnivorous women (44.5 versus 41.6 mL per kilo per minute) in a cross-sectional study. That does not prove veganism "improves" VO2, but it reinforces that plant-based diets are not an obstacle to aerobic performance.
Plant protein and the art of combining
The old idea that plant protein is "incomplete" and requires rigid combinations in the same meal has been overcome. Sources like soy, chickpeas, lentils, beans, tofu, tempeh, peas and quinoa supply all essential amino acids over the day. Soy in particular has an amino acid profile comparable to animal sources and is rich in leucine, the amino acid most linked to muscle synthesis.
In practice, studies suggest that plant-based athletes may need a little more total protein, near 1.6 to 2.0 g per kilo per day, because the digestibility of some plant sources is lower. Spreading protein across meals and varying sources usually does the job. Before changing your strategy, talk to a dietitian.
Points of attention: B12, iron, omega-3 and creatine
The plant-based diet is not a free pass. Four nutrients deserve monitoring, and the evidence is clear about it.
- Vitamin B12: there is no reliable plant source. Without supplementation, deficiency is common among vegans, and B12 is essential for the nervous system and the formation of blood cells. Evidence points to supplementation as the safe path.
- Iron: plant (non-heme) iron is less absorbed than iron of animal origin. Combining it with vitamin C in the meal improves absorption. Endurance athletes, especially women, should monitor their stores.
- Omega-3 (EPA and DHA): flaxseed, chia and walnuts provide the plant form (ALA), converted in a limited way. Microalgae oil supplements are a studied alternative.
- Creatine: since muscle stores tend to be smaller in those who do not eat meat, studies suggest supplementation can bring extra strength and power gains.
Real athletes who prove the point
Elite names show you can reach the top without meat. Tennis player Novak Djokovic has followed a plant-based diet for over a decade and credits part of his recovery to it, with 24 Grand Slam titles in his career. In brute strength, German Patrik Baboumian set yoke walk world records as a vegan. In extreme endurance, ultramarathoner Scott Jurek accumulated historic wins and a record on the Appalachian Trail eating only plants.
Individual cases do not replace studies, but combined with controlled evidence they tear down the myth that meat is a prerequisite for performing. Science's message is balanced: the plant-based diet can sustain high performance, as long as it is well planned and the nutrients of attention are cared for.
