wow, that's not the expected question! heck no, you don't have to snack. hunger is a natural sensation, a perfectly healthy one too. there's nothing wrong with feeling some hunger during the day. in fact, it was likely extremely typical - an integral part of life - until recent times.
eating a snack is not the worst thing, but i do think that eating square meals is a far, far better bet. good for you, stick with it.
"dean ornish and dr. davis think the palmitic acid our bodies use for fuel while we sleep is poison if we eat it. zero-carbers like charles washington think the oldest fuel in our evolutionary history – glucose - used by organisms a billion years ago and without which the brains of modern mammals cannot survive for more than a few minutes – is an unnatural toxin if you eat it. both views ignore basic facts of medical physiology and defy evolutionary history." - kurt harris