First time I tripped I had no problem eating. Drank a fuck-ton of swampy filtered water from the lake we were staying at, too! The harder I'm tripping the less I like to eat; most recent 'cid trip I didn't want to eat at all. One of the guys I was with whipped up these strong curry-noodles: the taste was too intense, I couldn't eat any.
I always have tracers, I use them when I'm coming out of my trip before the hallucinations calm down to see how long they last.
I had bowel irritability from 2c-i and my left eye still flutters from 4-aco-dmt. I think these things will pass with some time and healthy habits.
Hmm I don't have tracers on things.....but sometimes the wall or ground will seem to be moving a bit and I get other slight visual distortions like that. Also, lights outside at night look more like they should when I'm tripping and that's been ever since I first tripped a few times on shrooms and once on acid two years ago. The last couple times I tripped on acid seems to have even intensified that effect even though the last time I did not get a very strong effect because I had tripped so soon before it.
I think it all depends on how into the drug you are. If you enjoyed it, why wouldn't you want to see some trippy shit every once in awhile? If you didn't like it, I can see how it would be a problem and a a possible unwanted side effect. I myself still see laughing faces from my first time on cid when I get high or even when i'm on Molly. I just get into I guess...