I understand why people don't want nuts on flights, but it would be very hard to police.
OK, don't serve them, but you would also need to make sure that passengers had been instructed not to bring nuts on the flight and that they all obeyed the instruction which is obviously impossible.
Have there been any recorded incidences of allergic passengers suffering a reaction due to nut vapours in the cabin air? (Genuine question BTW, I'm not being snippy).
There are plenty of other snack foods available, so no-one is going to starve.