They have several meals a day, which are as follows:
Special thanks to Merry and Pippin for explaining this and if you want to watch them explain see the clip below.
It also has to be said Bilbo Baggins makes a brilliant statement at his birthday speach, you can either watch it in full or read the part I like best below.
"Alas, eleventy one years is far too short a time to live among such excellent and admirable hobbits. I don’t know half of you half as well as I should like and I like less than half of you half as well as you deserve."
This is a great quote from Gimli but one I struggle to remember, so it is now recorded here
"Certainty of death, small chance of success, what are we waiting for!"
You can watch Gimli below.
However to get the full context see this