According to WHO, world hunger is a big problem:
But 800 million people is not 2/3, not even 1/3, more like 1/7 of the human race.
Not that it should be ignored, of course, but exaggerating the scope of it isn't going to help.
And, I'd be willing to bet that a smaller proportion of the world's population goes hungry now than was the case a couple of hundred years ago.
200 years ago, Indians had buffalo, peoples of Africa were hunters/gatherers/farmers (not converted to white mans culture, not yet subserviant to it.), peoples of the world were integrated with nature, not living in large cities. "...exaggerating the scope of it isn't going to help..."