In the end though, it's just food. I could launch a kickstarter campaign that sold veggie shakes and claim it makes people feel healthier when they drink them and it would be no more harmful than this campaign.
Nowhere do they recommend that you replace every single meal with Soylent and the creator stated many times throughout his many blog posts that he continued to eat normal meals whenever he felt like eating normal meals. This is in contrast to something like the movie Fat Sick and Nearly Dead (http://www.fatsickandnearlydead.com/) which actually does recommend drinking veggie shakes exclusively for every meal for 90 days.
This is not a veggie shake though. I'm pretty sure most people who eat this would eat this in conjunction with other foods, but the few that really do try to eat Soylent alone, and for long periods of time, which is exactly the idea they're pushing, that may be harmful.
