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‘AMERICAN HEARTBREAK’ HAS 34 songs, an improbable number but not, apparently, an undigestible one.

Food can trigger symptoms, and a diet low in FODMAPs — undigestible carbohydrates — has gained many supporters.

Ruminants play host to bacteria that digest the otherwise undigestible grass and other cellulose-rich plants those animals eat, making nutrients such as fatty acids available to the beasts the bacteria inhabit.

It's believed to be associated with the undigestible beaks of the whale's principal food, the common cuttlefish, and squid.

Components that are not essential nutrients but provide other benefits are only now being recognized, for example, “Human milk is full of undigestible matter,” German says.