Efficient how? You could make an argument that eating meat is a less efficient use of resources such as land and water, but I doubt that eating a whole meat-protein full of the correct amino acids is less efficient than eating a combination of vegetable proteins to get the same effect.
And yes, you do get vegan powerlifters, but they are very much the minority and an outlier.
> but I doubt that eating a whole meat-protein full of the correct amino acids is less efficient than eating a combination of vegetable proteins to get the same effect.
It is entirely possible to have a complete diet, "correct amino acids" and all from a vegan plant-based nutritional plan.
And yes, you do get vegan powerlifters, but they are very much the minority and an outlier.