If this was 'real', then he absolutely couldn't have survived without meat.
A NORMAL human must eat more meals when he eats vegetables versus meat. Now think about this guy that has to eat several kilograms of meat on ONE meal, and that won't even last him more than a few hours. He should literally never be able to stop eating since the time it would take to eat should have burned through all the energy the vegetables he ate would provide.
That is why the larger animals are mostly carnivores, or at least omnivores. And those that are not, act sluggish most of the time.
For comparison, elephants eat around 150-170kg of vegetables in a single day and about 75% (up to 18 hours) of that day is spent doing that. That means that elephants eat almost every waking moment if they can. And THAT just to be sluggish most of the time.