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Hills alum Kristin Cavallari is on a health kick!

"Such a beautiful morning. Started a 10-day detox today...protein shake for breakfast and it wasn't bad!" the reality star, 23, Tweeted August 3.

According to Cavallari, the 10-day detox consists of a variety of vegetables, protein shakes, fish, chicken and brown rice, which are delivered to her home daily.

But shortly into the detox (which began with three days of consuming just protein shakes), Cavallari admitted that committing to the cleanse wasn't as easy as she'd thought.

"So its day 5 of my cleanse and its been pretty easy until today," she Tweeted Sunday. "I can't stop thinking of all the food I want!"

Still, the Hills' resident bad girl insists she isn't doing the cleanse solely to drop a few extra pounds.

"Just wanna make 1 thing clear-the cleanse is not for weight loss. Its for health..and I feel great!" she Tweeted Monday.