Rob Kardashian had his best performance yet on Dancing with the Stars on Monday night.

He is definitely lighter on his feet and has lost weight. And there are several reasons for that:

His rigorous workouts

His special diet

RumorFix has learned that Kim Kardashian’s baby brother is enjoying healthy meals from Z.E.N, which is Zero Effort Nutrition, a Los Angeles -based food delivery program. Celebrities like Zac Efron, Denise Richards and Shannon Tweed also get the daily meals that are nutritionally balanced.

The gourmet food delivery program is designed by nutritionists and dieticians. Meals are customized for each client. The company’s website claims that people can lose up to 20 pounds in one month.

That diet stabilizes blood sugar, decreases cholesterol levels and increases energy.

Rob is given a cooler bag every day with his meals for the whole day.