I've seen perhaps a half dozen "interviews with old people" in the past 20 years or so in which the subjects each cited their long term use of "sweet taters" as one of their "reasons" for living to notably advanced age. Although such anecdotal witness doesn't mean much in rigorous scientific terms, (George burns said his long life was because he always smoked at least one big cigar a day) it's hard to argue with the merit of the yam as a part of one's diet.

As several said, you can stick a sweet 'tater in your pocket when you leave for work, and you've got lunch for the day. I've tried it for a couple of weeks at a time, when other "preparations" were inconvenient, and it does work at least as well as most other similarly simple tricks.

John