This is my 3rd week on Adderall, took 10mg the first week, and upped it to 20mg the second week, which is what its staying at for now. It obviously works better if I take it on an empty stomach but my question is, if i eat after I start feeling the effects, will it mess with the absorption, or will it not make a difference?

This is just my guess, but I would think that if you're feeling the effects, then it's already absorbed. Are you on XR or IR?

I would not suggest eating highly acidic foods.

My doctor told me to make sure when I take it in the morning to make sure I have a regular breakfast. All he said is that it will make a huge difference if one day I'm eating cereal and milk and the next I drink just a glass of OJ. Either way he suggested that I eat something when I take it.