Not food, but I bubble wrap 2-3 neuro sleep bottles in my checked luggage for combating jetlag.
http://www.drinkneuro.com/product/sleep/
Personally the drink is more effective for my body than one single pill of melatonin to prevent the 2-3 am wakeups. Only problem I can only use it at the hotel, not onboard the flight due to carryon liquid regulations.