Does this do some kind of analysis to help spot what foods might cause problems? That would be useful. Otherwise would this be any more useful than a spreadsheet?
This is way more web 2.0 than a spreadsheet and is just as hard to take to your doctor.
Sounds like a winner.
I like your sense of humor, but that's kind of mean. This is decent for being built at a hackathon. If the creators wanted to take thsi further I think analysis would move it from "OK, but what good does it do me?" to "I might use this to help find out what foods trigger my allergies/Chron's/etc."