Sarah Wu, a Chicago Public Schools speech pathologist, holds her son Charlie Wu at their suburban home. She is the author of “Fed Up With Lunch," a new book based on her blog documenting her school lunches. (Terrence Antonio James, Chicago Tribune / October 5, 2011)

Sarah Wu does not look like a troublemaker. The slight, blond mom comes off, by her own admission, as "a super nice person … without a bad word to say."

That may be why the speech pathologist was able to crank out an incisive daily blog scrutinizing school meals for an entire year without anyone suspecting her. Writing as "Mrs. Q," she bought lunch each school day of 2010, photographed it, ate it and wrote about it that night under the title Fed Up With Lunch.

One early post noted: "Oftentimes what is served barely passes muster as something edible." A few days later: "I want less pre-fab food and higher quality options. Less crap, you know?" A lasagna lunch drew this review: "Wow. Truly monumentally bad. I