Everything you ever wanted to know about food but were afraid to ask.

On the surface, groups such as carbohydrates, fats, fiber, and even protein may all seem pretty straightforward. But scratch below the surface and these terms are often misunderstood or used in the wrong context.

Our first example is “fruitsandvegetables.” This isn’t a typo; it’s written that way because people often refer to them as if they were…