There are plenty of premium WordPress themes out there. However there are very few modern and functional themes for a healthy restaurant or cafe.
The following are the best themes I discovered after extensive research:
ElegantThemes.com are one of my favorite WordPress clubs. I was not surprised to find the best theme in their collection.
Foxy Theme from Organized Themes
This modern and edgy theme is perfect for a restaurant in the big city or any downtown establishment.
Monmarthe Cafeteria Theme
A very creative design for healthy cafes.
Explore the following site for better selection of premium WordPress Themes: