How Many Times a Week Do Americans Eat Out?

I was really curious to find this out. I had heard quite a high number on average on some show. I can't remember if it was on Food Revolution or just on Suze Orman. Both of these shows are pretty hard on eating out just because it can be so poor for people's health and wallets. However, I had written down that the show said it was 4-5 times a week. I couldn't find it again on the internet but I wasn't checking on a fancy Tablet or anything. That makes sense if people are going out to eat at work for lunch. However, I really didn't think it was true. I found plenty of people quoting this statistic but no one said where they got it from. Do you think it's fact or fiction and doesn't that number seem quite high?