There is also no evidence that the quantities and ratios of nutrients in the formula are anywhere near complete or optimal.

The easiest way to illustrate how this can be a problem is to compare the difference between growing cells in minimal media versus complex media, where they grow much faster.

Soylent is basically a crude minimal media for humans. The proper comparison for soylent will be against someone who is eating a complete diet, not someone who is skipping meals or eating poorly.