Food is something you eat every day. In this case, it's pennies that add up-- and pretty quickly. My monthly food bill (when I'm not skimping) is typically second only to rent and taxes.
Consider- 1/4 a box of that barilla pasta I mentioned... 400 calories costs maybe $0.50. Add sauce and you're maybe up to 500 calories and $1.00 for the meal. Drink water, or maybe a cup of gatorade for another $0.50. A meal for around $2.00. Cereal for breakfast is probably similar, $2.00-$2.50 per meal.
Ruling out breakfast, consider 2 meals a day for a month. At $2 for lunch and $2 for dinner for 31 days, that's $124/mo. A $7 lunch and a $10 dinner is $527/mo. In 3 months you'll have saved $1,200.
Penny-wise, pound-foolish... wow