LOL. I wouldn't say "healthy", but not poison. Maybe healthy because they made people feel happy. My favorite part of the entire endeavor was watching people biting into the donut with Dunkin or Krispy Kream expectations, but having a completely different experience.
Another note, if there was custom coloring for glazes or sprinkles I made food coloring from natural elements. For instance, beets for red, a blue flower (can't remember the name) for blue, another way to make blue was with cabbage and baking soda, purple from blueberries and blackberries, spinach for green, and turmeric for yellow. And since I had the RGB covered, I could make a lot more colors. Everything came out pastel, but they were still pretty.