It’s very easy to test, if you know someone who is lactose intolerant… 😉
The cream inside your Twinkie is not the same thing as the cream inside that eclair at the fancy French bakery—we know that, because real cream goes bad after a while, and can’t sit on shelves for months. So what’s really inside that Twinkie? (And are you sure you really want to know the answer?)
Real buttercream frosting is just sugar and lard and vanilla, so I was expecting something along the lines of chemical fat.