I dunno, there is a real kind of liberation you can have if you are on some diet that is all planned out. I did a week's fast and was amazed at how much free time I had now that I wasn't eating or shopping for food or preparing food or cleaning the plates, thinking about what I was going to eat or travelling to or waiting for food at restaurants.

Of course you can do it more wholesomely and cheaper than Soylent if you follow the bean plan of Tim Ferris.