[gnoway]

They are probably treating it like more of a smoke test. In 10 days you can certainly get a good idea about changes in flavor, texture, preparation, etc. You also ought to get some feedback on whether a formula change resulted in any immediate health concerns.

[mratzloff]

They aren't getting any feedback on immediate health concerns in just 10 days unless they decide to add peanuts or arsenic to the mix.

[gnoway]

Keep in mind that this may be the only form of nutrition the 'beta testers' are getting, and possibly have been getting, for a significant amount of time.

If you're eating normal food then some deficiency in one component of one meal may be masked by a surplus in another, and in particular if you eat a varied diet then that deficiency could start and stop within one meal. If instead your sole source of nutrition is suddenly deficient, it's not a stretch to think that you could notice a difference within 10 days.

I'm not trying to defend the product, I just don't think it's inconceivable that 10 days is long enough to notice a big problem with a formulation change.