"Pretty -- but unsafe to eat," the video warns, zooming in on the cake. The same can be said about most precious jewels, and well-proportioned human beings.
Amazingly enough, this is not the first time the FDA has felt the need to remind the general public that they should really go easy on the glitter. Back in November, the administration put out a warning about the trend, reiterating a PSA they'd issued in 2016 that claimed even though flashy TV show chefs were using the stuff, us plebes should not try it at home.
If glitter-consumption is truly important to you for whatever reason, there are, in fact, some sparkly products that are safe to eat. According to the FDA, folks should check labels for ingredients like sugar, acacia (gum arabic), maltodextrin, cornstarch, and color additives approved for food use. Glitters that don't list ingredients, or that you've located, say, next to cans of lead paint in an art supplies store are probably not a good choice.
Either way, we are of the humble opinion that you should just not bedazzle your baked goods.