Chasing is clearly spreading FUD. Claiming they are breaking FDA rules, without any backup to that assertion is pretty much the definition of FUD. What FDA rules could they be violating?

----Edit: Also noticed this----

Soylent will be produced in an FDA-approved facility with strict regulatory controls ensuring safety.

Technically he says he thinks he broke some FDA rules. His phrasing could've been better, but his point stands--perhaps it's false advertising? This is what the campaign site said:

"Soylent is perfectly balanced and optimized for your body and lifestyle, meaning it automatically puts you at an optimal weight, makes you feel full, and improves your focus and cognition."

After that, they don't offer any comprehensive list any ingredients, any recipe, any nutritional information (if you find any, I'd be glad to retract this point). Also, as far as I know from the guy's blog, the idea is to replace your diet with Soylent (and water, I guess). Surely that's false advertising, by saying your food can replace all other foods, while your food hasn't even been tested yet? I'm sure if it was just some fruit smoothie thing they could get away with saying that it's a healthy food. But as a complete, all-round food-replacement? I'd be careful with that.