I’ve borrowed the title of this post from an excellent essay by David H. Freedman in The AtlanticÂ about how “junk food” could help curb obesity. The essay begins with three smoothies. The first two are both expensive, heavy on calories, and take several minutes (one of them up to ten) to make. The third is cheaper, lower in calories, and ready in seconds. The first two are considered “healthy” because they come from “healthy” (vegan, organic, wholefood etc) establishments. The third is “unhealthy” because it comes from McDonald’s.