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Teachers wanted to know how Mosso had been able to get young students to eat at least five servings of fruits and vegetables each day , so she trained colleagues from 17 other school districts at in-service workshops . Local graduate students Kate Davis and John Klingemann often guided groups who wanted to cross the Rio on the local " ferry " in order to eat at one of the great restaurants in Mexico . Just as you could say " My father ate at seven every night , " " My father used to eat at seven , " or " My father would eat at seven , " you could just as easily state , pure and simple , " My father ate at seven . " By training mice to eat at a time when they normally would n't , the researchers found that food turns on body-clock genes in a particular area of the brain . Perhaps unlike most of you , I actually have such bad habits as to eat at McDonald 's from time to time - - in a huge-university town no less - - and no , I do n't think it 's too likely that there are a lot of college degrees back behind the counter .