I like this idea because it means you can completely control what you are putting into your body, and adjust the levels when needed. It seems very likely that this Soylent drink is much more nutritious for you than what you're probably eating right now.
However, I think an issue with this diet is that if you've been on it for an extended period of time, your body might reject any food you give it, disallowing you to eat traditional food when you want to. Also this liquid diet will probably get very boring after a while.
What do you think?
The first post.
The ingredients.
Not sure if this was a statement about the weather:
I think it's a terrible idea to rely on this concoction only. The chances that he is missing something or misdosing something are very high. We still don't undertsand nutrition enough to even know what mistakes he might be making. I could see drinking this and eating one meal per day, but to replace food with it altogether seems very risky.
You could eat a multivitamin, and egg, and bread, and go for a very long time without any ill effects. However, you might not be better for it in the long run.