It's been a while since I saw, but let's see what I remember without referring to wikipedia...
As I remember, there are cannibals living in their jungle, but there's some mad doctor type making zombies out of their dead I believe or really anyone he can get his hands on. So they're a little afraid of him and stay away from his creations and territory. The zombies themselves I don't even remember eating anyone, they're more like undead goons he sends after folks to kill or capture them.
At some point a group of other people come to investigate and they run into the cannibals who they fight with and then later the zombies. At some point I think one of the white women gets captured by the cannibals and strip her naked, but it turns out that they have some sort of prophecy that she's their white goddess queen or something (Lol) so they ultimately side with the people that came to investigate and they storm the mad scientist home (who has been torturing and experimenting on a few people during all this ) and that's where there is a scene where the cannibals overpower the zombie and start eating its guts ( kind of a brief scene) and the remaining investigators escape.
Like I said, it probably sounds better than when you really watch it. Then again I do remember being pretty hyped up to see it and then I was disappointed by it, so maybe I just built it up too much. Maybe I'll give it another chance one day.