Was this a natural Pheromone effect?

Several years ago myself and some friends went to the local zoo on a sort of double date. We realized at one point that the animals were quite nervous with my presence. Best example: a certain species of ape who’s name I don’t recall, (think chimps with throat sacks) were quite wild and jumping around in a fit. I left my friends to go get a drink at the snack bar, as I approached they went nuts again, females grabbing young and rushing to the far side of the cage and others jumping around making whooping noises.
In hindsight I think it may have been a temporary pheromone signature I developed, I was kickboxing at the time and was on a special high fat and protein diet in order to burn bodyfat and make my weight class, my diet was basically steak and bacon. Could it be I was making the animals restless by giving off the scent of a predator resulting from an almost exclusively carnivorous diet?