Aside from loss of appetite, I've noticed another interesting side effect of taking Concerta, verbosity! If you want to be a writer, take amphetamines. Seriously, I could write a book.
I'm not so sure that I could sit and read for longer than usual, which, incidentally, would be about 20 minutes on a good non-Concerta day. But, man, can I quickly compose long sentences, nearly every word of which I contend to be at least amusingly informative! TMI? Not on Concerta!
But I'm not upping my dose, I promise. It lessens impulsivity, remember?