We always get pizza delivered on Friday night and we generally eat out at least one other meal each week. I didn't miss the food but I did miss the experience of choosing the pizza place, toppings, etc. and having a fun night with my husband. BUT the challenge helped my focus on just how lucky we are to afford that extravagance. We don't blink at spending $20-$30 on pizza. That's ONE MEAL for 2 people, which costs over 3 times a whole day's food budget for two people!
My thoughts on frugal eating: Cut out meat and you're about 10 steps in front of everyone else when it comes to frugal eating! You always hear how expensive produce is but meat is the real dollar-hog. I got quite a few fresh fruits and veggies into my diet: apples, bananas, oranges, carrots, potatoes, cauliflower, onions, cabbage, celery, lettuce (not including my free peaches and blackberries). But you also have to know where to get your protein when you cut out meat. You can see above that on several days I didn't make it up to the 60 grams of protein. Note to self-eat an egg at breakfast!