[Karunamon]

It sounds like the FDA classified it for them.

Given:

- The FDA considers it a food

- Soylent considers it a food

- Soylent users are on record as consuming mostly or all the product for their primary complete food source..

- ..over long periods of time, including the founder, who supposedly lives on the stuff.

- Of those users, most are reporting positive results...

- ..and the negative results are generally of the classes "don't like the taste" / "gave me bad gas"

..then I'm left to conclude that it is a food, and a pretty good one at that.