In-N-Out Burger is a small fast food chain of legendary status that is only available on the West Coast (and apparently some parts of Texas). They're known for their "secret" menu and even the movie stars in Hollywood love this place.
This college student claims to love In-N-Out Burger but he was not ready for this challenge. According to his follow up interview with OC Native most of the charm had worn off by day 30:
I definitely don't think I'll be able to eat In-N-Out for a good while. I only gained two pounds through the 30 days. My final weight was 160 pounds. I will say, although In-N-Out is delicious every once in a while and it's a high quality product, I would not eat it for a month straight again. Please don't try this at home, kids.