From mid-2015 to mid-2016 I got about 1/3 of my calories from Soylent, a "meal replacement" that's kind of like a protein shake, except there's fat, carbs, and protein -- everything you need for a meal.
I want cheap, healthy, quick-to-prepare food, hence the appeal of Soylent.
Long story short, it turns out that:
Soylent's primary ingredient is maltodextrin -- that is, sugar -- and
Soylent contains very high levels of lead and cadmium
EDIT: Looks like Soylent 1.6 significantly reduced its lead and cadmium levels; the levels of their formula version 1.5 were very high. But it's still largely sugar, whereas 1.4's primary/most common ingredient was rice protein IIRC.
And they either believe or pretend to believe that their maltodextrin levels is not an issue:
We stand behind it. 🙂— Soylent (@soylent) July 2, 2017