Athletes used to eat thick steaks before competition because they thought it would improve their performance. Protein supplements are sold at health food stores. This concern about protein is misplaced. Although protein is certainly an essential nutrient which plays many key roles in the way our bodies function, we do not need huge quantities of it. In reality, we need small amounts of protein.
Protein supplements are expensive, unnecessary, and even harmful for some people.
This recommendation includes a generous safety factor for most people. Since vegans eat a variety of plant protein sources, somewhere between 0.8 and 1 gram of protein per kilogram would be a protein recommendation for vegans. His RDA for calories is 2900 calories per day. So, in the US it appears that vegan diets are commonly lower in protein than standard American diets. There do not appear to be health advantages to consuming a high protein diet.