Why is the subscription 21 servings at a time for a month’s supply? Wouldn’t 30 make more sense?

Chris Bair is a technology and computer geek. He became involved in the nutritionally complete "future foods" movement in January 2014, originally with a conventional recipe and later switching to a high fat, low carb "ketogenic" variant on October 2014. In January 2015 he created the recipe for Keto Chow and released it without restriction for anyone to use, at the same time he began mixing the recipe up for people that wanted a finished product and has seen steady growth in the business every month since.