Protein in Plant Based Foods

The RDA is 0.8 g per kg of body weight (~50 g/day for a typical adult). Active individuals benefit from 1.2–2.0 g/kg. A plant based athlete eating 1.6 g/kg can achieve this through meals built around tempeh, tofu, lentils, hemp seeds, and pumpkin seeds.

Leucine is the key amino acid that triggers muscle protein synthesis via the mTOR pathway. It's abundant in soybeans, tempeh, pumpkin seeds, lentils, and hemp seeds. Plant based athletes optimise leucine intake by centering meals around these foods — particularly post-exercise.

PDCAAS and DIAAS measure protein quality based on amino acid composition and digestibility. Soy protein scores highest among plant sources (~1.0 PDCAAS), followed by quinoa (~0.9), hemp (~0.66), and most legumes (~0.6–0.7). Fermenting, sprouting, and cooking all improve scores by reducing antinutrients and improving digestibility.

Yes — research consistently shows plant based eaters meet protein requirements through whole foods. Legumes, tofu, tempeh, seitan, hemp seeds, and quinoa are reliable protein-dense staples. Eating a varied diet across the day naturally provides all essential amino acids without any need for precise meal combining.

Cooking slightly concentrates protein per 100 g in wet-cooked legumes (as some water is absorbed by the food). It also deactivates antinutritional factors like trypsin inhibitors in raw soybeans, improving protein bioavailability. Sprouting grains and legumes before cooking can further enhance digestibility.