We’ve been told for decades that breakfast is “the most important meal of the day.” More recently, studies have made headlines suggesting that skipping breakfast is unhealthy, apparently vindicating General Foods, the company that started this myth in the 1940s. I wrote about this claim, and the bad science behind it, in a previous email.

There’s something, however, that I didn’t address in that email. I think most of us would agree that the American Heart Association (AHA) putting their “heart-healthy” stamp of appro...