Why does Slim-Fast smell like dog food?

Hopefully you know what I mean; those Slim-Fast diet shakes are tasty enough, but they have this faint pungent odor that reminds me of a trip to the feed store. Bit of an aftertaste along those lines, too. I’ve noticed it in every diet shake I’ve been exposed to. It doesn’t ruin it, but it strikes me as something that the Slim-Fast corporate office would desperately want to get rid of.

I believe it’s the fact that a lot of fake foods tend to farm protein in the same way (often yeast) and it tends to have a characteristic smell. That’s a WAG, no cite.

I believe it’s the soy used for protein; I noticed the same smell from the soy formula stonebaby used to drink.