I don't like eating while I'm tripping, except during the come-down phase when everything is wearing off. Eating just feels wrong when tripping, since it feels hedonistic and I try to take psychedelics to a more spiritual place. The only times I've eaten while tripping have completely ruined the trip and brought me down to a really depressing hedonistic kind of couchlock high. Some bites of fruit can be good to make sure blood sugar is on target, and I love drinking water or tea. Other than that, save it for afterwards.