WHY do the people of Jannah eat

AlQurtubi says, The people of Jannah do not eat to relieve themselves of pain of hunger; they do not drink to quench themselves of thirst; they do not put on perfume to eliminate bad smell. The reason that they do these things is because they want to have continuous pleasures. And he says to look at the two verses where Allah tells Adam in Jannah: “There is therein (enough provision) for thee not to go hungry nor to go naked.” (20:118) 

So we’re not putting clothes on in Jannah to cover our nakedness; we’re not eating to relieve ourselves from hunger; nor are we suffering from thirst. So everything in Jannah is for the purpose of pleasure and pleasure alone. Then he [AlQurtubi] says, Everything that people used to like in this world, similar will be given to them in Jannah, but then Allah is hiding from them things we don’t even know about.