A big thing that no one has mentioned yet, it you can get so much healthier just by cooking at home and not eating out as often. Most chain restaurants are so profit driven, they will use the lowest quality product they can get away with. And seeing some of the kitchens they cook in, I wouldn't let my dog eat there.
I remember the last time we went to Golden Corral (a chain buffet for anyone who doesn't have one locally) after not "dining out" for about 6 months prior, and when we got home the race was on for all 4 of us to get to the bathroom. Everyone was sick to their stomach for at least 24 hours until we "flushed" out our systems.
We try to use top shelf ingredients at home (meat, fresh produce, etc.) but our big change came when we gave up eating out. I haven't set foot in a McDonalds in 4 years, and my kids haven't been in one in over 2 (thanks Grandpa!). We eat out 1 time a month at most, and that is usually a good local sitdown restaurant. Of course, there are good restaurants out there, but they are so expensive I can make 3-4 meals at home that are just as good, for the same cost. Everyone should have a crock pot and a few recipes to get started, and just like anything else in life, you will become a better cook with practice. Plus you will know exactly what is in the meal you are eating.
Back on topic, I did see the movie and it was a real eye-opener. I would recommend it, and if it makes you squeamish, that's what it is supposed to do. Also watch "Super Size Me" from Morgan Spurlock for an eye opener on what fast food is doing to us and especially our kids.