This is a bug that I've experienced since buying the game two months ago. It has persisted through at least two patches. I find that the food info disappears whenever I switch locations, but saving and immediately reloading the game at a new location restores the food info. Not a game-breaker because its easily rectified with saving and reloading, but it does get annoying when you forget what effects food has.
Honestly though, unless you take the trait that doubles the magnitude of food effects, food is a little useless because the effects of most food are mediocre (+1 str with 100% slow) and don't last very long. Making food effects last ten turns might make it more appealing. After hitting level 10 with my characters I sold all my food and food ingredients to free up inventory space and haven't regretted it.