The world death rate is about 8 per 1000 people per year. If there are 50 pounds of edible meat on a body, then human deaths could supply 0.001 pounds per living person. This is also low-quality gamy meat because the average age of death among people is incredibly high for meat animals. Enacting worldwide cannibalism for humans would provide as much additional meat as spending one tenth of a cent per person annually on conventional low-end meat.
Since the median age of death is 82 (78 if free), riddled with an entire pharmacy of modern medicine i suspect that's a very, very unhealthy proposition.