the question is not yes or no, but why?
Because for instance I'm a slow walker and more often than not, I found it quite difficult to get healthy, high protein laden food on my way. Either because my timing was wrong, the tiendas or restaurants were closed or fish and meat were served fried, combined with high carb side dishes.
On my next Camino I will, if it requires any longer walking than 12 days, I will take some extra protein with me, though no proteinbars, but water-solvable medical quality protein. I lost some weight on the Camino, and if you lose weight and don't have an high enough protein intake, your body gets the energy it needs from the muscles, which are then broken down, that results in muscle loss, which is the opposite you'd want, when walking four to six hours a day.
When I arrived back home, my physical strength was measured and it was down compared to before walking the Camino, though my stamina had increased.
I decided against taking protein with me it this year, though I had already bought it, because it would have added two more kilos of weight to carry. But now, knowing how easy it is to send stuff ahead to any correos office on the Camino, I'll do that next time.
Then I'll find out, whether this is going to work out better for me or not.