Not a problem!

In general, the active collection of information like dietary intake through questions is ineffective. There are many reasons to avoid direct questioning when it could compromise a persons character. A good example would be to hide potentially embarrassing facts from peers. 

It would be better to have ask what kinds of foods students prefer to eat with a small list of loose categories. It's important to avoid negative descriptors in this. 

Example:
Please select any of the following foods you enjoy: Pizza, Pasta, Pastries, Frozen food, Salads, Sandwiches, Soups, Sushi, Burgers, Fries
(continue on with beverages and other preferences if this is relevant to your hypothesis)


Keep in mind while there may be correlation to some of these data points and grades, that does not necessarily imply causality or interdependence.  

For gold standard data, ensure your survey questions take minimal effort and time.
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