The 37-year-old has also vowed to avoid sugar and continue with her intense workouts to look her best for the annual high-end event.
However, Kim – who took a mould of her naked body for her new perfume bottle – took to her app to say she's already struggling with the strict regime.
She said: "Right now, I'm on the third day of my… cleanse! I'm SO excited to do this, you guys, but I definitely need to mentally prepare, lol.
"I have the Met Gala coming up and I've worked so hard working out, but I started eating a lot of sweets and I wanted to just change my food patterns to eat healthier and cut sugar out of my life as much as I can.
"We always have sweets around and it's really hard when there are temptations everywhere."
E! News reports that Kim is eschewing meals in favour of "nutrient-filled shakes" and herbal tea on days four to six of the Optimal Cleanse.
On the other days, the reality star is allowed "two to four solid meals" which include spice mustard salmon salad and butternut squash with soup and salad and romaine lettuce chicken cups.
Kim added: "I already completed day one and two of the cleanse, and I've been surrounded by doughnuts, but I stayed away.
"I'm so proud of myself! I wanted to do this cleanse because the food looked so filling and there are only three days that you just drink liquids."
Kim added: "This is seriously not a sponsored thing, I just really wanted to try it. I'll keep you updated on how I like it."
This year's theme is "Heavenly Bodies: Fashion and the Catholic Imagination" and Rihanna, Amal Clooney and Donatella Versace are the hosts of this year's bash which takes place on May 7.
Meanwhile, Kim is "worried" husband Kanye West will end up in hospital again after splitting from his manager.
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