It won't hurt anything, but like was said above, lots of people don't get hungry. Personally, I love eating on L. The taste is enhanced by a lot.
Drinking some orange juice with lots of vitamin C is a good idea. Ive never had the desire to eat while im tripping though.
I've only tripped once on L, and I had taco bell... Amazing lol me and my friends kept bursting out laughing with taco in our mouths. Fun.
YOu may very well find you're so distracted by all teh wodnerful thing that you wont need to. however go ahead and drink some water! As for food. HAve a go at some well riped fresh fruit. ALL senses, including taste are heightened but this could be a bad thing at times.
Definitely drink some water. It's never good to go 8-12 hours without any water. As for eating, if you're hungry, eat It'll feel amazing. I had a Ben and Jerries Half Baked bar during my last trip, and it was awesome (anyone have any guesses as to where I ate that ice cream bar? hehe)
I drink a lot of water on lsd, I had coca cola on lsd before aswell, I've eaten crisps on lsd and even a complete meal once. I think eating and drinking on lsd should be the same as sober: drink when you're tristy and eat when you're hungry.
Don't eat anything heavy, like say a... cheeseburger?? You can feel it digesting & it could make you feel kind of sick. Salad, wheat crackers...keep it light & natural. & lots of water, mmm.
Most of the time when I try to eat on acid, I just can't bring myself to. Usually I don't get hungry, but sometimes around the comedown I start to feel my stomach telling my that I haven't eaten most of the day. I've responded to this once by actually eating a very dense vegan protein cookie...It wasn't a very good idea because like someone said, you can feel it digesting and stuff, and since it was a dence protein cookie, it didn't digest until this next day, haha. Also I think if one is to eat things on LSD, it feels better to eat raw things. But I do enjoy drinking water.
of course - dont forget to drink water, this is more important then you might realize. you must keep yourself hydrated and the more water in your body the more conductive you will be to energy (you will feel better or higher)! i usually dont eat until much later in the trip when i am back to normal. if you want to eat something during a trip, eat some fruit. when i do it is near the end or when i am coming down. food tastes great on acid but i would keep it light until you are sober again.