"Among Muslims, the left hand is reserved for bodily hygiene and considered unclean. Thus, the right hand should be used for eating. Shaking hands or handing over an item with one's left hand is considered an insult."
A common enough sentence in many guide books and on Wikipedia. However, being left-handed it's quite often very unnatural - you reach for food with your dominant hand, pass something with that hand, and ironically the right hand is often the one used for bodily hygiene among left-handers.
Indeed, in Uzbekistan I picked up an apple with my left hand to the horror of the locals I was with on a train ride, at which point one of them who didn't speak English graphically demonstrated that right hand is for eating and left hand is for ... elsewhere.
So, if you're left-handed, how do you deal with it? Tie a string around your hand? Just lots of practice? Or do you just not care, even if their insistence on the right hand can result in them unknowingly getting a hand that is the very one they were trying to avoid?