healthy as in not having serious physical/medical issues?
all I can say is that i have/had real issues with having carbs in latter part of day, to do with blood pressure and blood sugar (and eyeball pressure, migraines, etc etc). however, most "normal" people will probably never have problems
I don't/didn't always have problems either..
what works for 99.5% of the population doesn't always work for the other 0.5%
edit: what I meant was, if you try it and it doesn't work, that doesn't mean there is no effect on anyone, just no effect on you. (think of the non-responders to creatine)