4. Make-it-yourself trail mix.

http://www.babycenter.com/0_10-fast-foods-a-pregnant-woman-could-love-and-five-to-avoid_1313899.bc
Add a cup of whole grain cereal to a handful of your favorite dried fruits and nuts (try dried cherries and almonds, or dried cranberries and walnuts). Keep it in a resealable bag in your desk or car for a handy, crunchy snack.