This one actually took some forward planning - Task #55 was to keep a food journal for a month.
Plus, as an added bonus, the automatically calculating calories thing has given me a nice dose of "Wow, that's way worse for me than I thought it was...". Turns out, popcorn is much better (less bad??) for you than hot chocolate and Saladas. WHO KNEW?!
(Side note: have you ever created recipes for baked goods in a calorie counter? It's TERRIFYING. I mean, if you're talking about a cookie recipe that makes 40-odd cookies, the end result isn't that bad. But when you add 200g of flour to the recipe and the calorie counter is all "Oh, that's a lazy 1000 calories", you tend to have a slight wiggins...)
Have you guys ever kept a food diary? Did you find your eating habits changed when you did?