jonslag posted some topics about them and somehow I was thinking about this

If zombies don't eat, they die... Or later they become crimson heads...

What about Ganados or majini? I dont think they eat other humans... Also IN RE 4 village you can see that all the food is rotten... That means they dont eat it... If thats right, they just die after starving, or after the parasite eat everything from their body?

This is a good question. I would assume they have to eat something. Maybe the Parasites feed off of the human host they are inside.

Majini and Ganados may not survive long. We don't know. Maybe plagas like eating rotten meat? Not sure.

boy I never thought about this before now...this is a very interesting topic...i think that Gandos probably just wither and die after a while with no food

For the zombies:they dont really need to eat to survive,but they want to eat anyway,because the virus reanimate only the main functions of the brain:means eating.
(the explanation of the T-virus in the first movie...,wich is totally right and realistic)

as for majinis...or ganados,its a bit more complicated,their human corps being controlled by some parasites,I guess like every parasite,its main objective is to keep his hosting alive,the host die....the parasite die(most of the time)
,so I think the parasite itself(or themselves) survive by eating what ate the hosting,in this case a human,so on my point the ganados(perhaps even the majinis) are eating like normal humans(meat,bread,etc...).
remember the scene in the ganados village at start?their working like normal peons(mostly because they have to eat and keep what they eat alive,until they kill it of course)
and there were also some cows and chickens,if they didnt killed them already,thats perhaps they need those for eating.
also instead of eating the 2 spanish policemans,they just burned one and feed DEL LAGO(or perhaps they were just attracting him)with the other one,means they dont eat the human flesh.

So as I already said, for me, the Ganados(I dont know much about majinis,didnt play re5 yet,but it look like same)are eating like normal humans to feed their parasites.

@PE: That explanation for the zombies isn't very realistic. If the zombies don't eat, then how does the virus survive? Every living thing on the planet needs some type of nourishment.

I always thought they died if they didn't eat, as the zombies in 28 Days Later did, that is what happens in the beginning of 28 Weeks Later, and even though that isn't RE, it is still a very logical idea.

In RE4 as frodomir pointed out, there was food, rotten or otherwise, and the tables were set, I think that the Ganados infected were very much like normal people, until they got the orders from the Big Cheese, and I don't meas Mendez.

Well I think taht company like Capcom is trying to follow biological laws...

Zombies have to eat to survive...

Parasites... Parasites eat host, host is under their control... You remember that when exploring village Leon said that all food was rotten...