Oh I thought people were mostly lactose intolerant. I guess you're right, but the nice thing about Soylent is that you can actually replace ingredients rather easily.
In his blogs he mentioned that in his head this could ultimately be a drink tailormade for your specific needs, so someone with whey allergy could swap the whey proteins for meat or fish proteins (if those are readibly available at all)
> Oh I thought people were mostly lactose intolerant.
People (and, really, adult mammals that aren't humans of European descent) mostly are lactose intolerant, which is a non-immune issue (and thus not an allergy.) Milk allergies (allergies to one or more of whey, cassein, or other milk proteins) are a different issue, but also a real thing.