Quick post: What’s the fuss about resveratrol when you can have a 5HT2c appetite suppressant do the same thing?

The new fountain of youth may be an empty cupboard.
Starve a little and you’ll live longer, is the new conventional wisdom –when you restrict calories, lots of good things happen to prevent aging.
Looking back at the people posting on the lorcaserin post who are on the trial and who don’t feel like eating — isn’t that extreme caloric restriction, too? Aren’t there health-prolonging effects of lorcaserin (and other 5-HT2c agonists)?

(Vintage stop motion puppet-toon of Little Miss Muffet, Old Mother Hubbard, Queen of Hearts, and Humpty Dumptycourtesy Internet Archive.org)
Resveratrol — found in red wine, among other things — is though to have a similar effect.
(See, here, for a recent PLOS paper on overlapping transcript profiles, and here for a Bloomberg report). I won’t go into all the ins and outs of NFkβ, except to say that extreme caloric restriction seems to be a life-prolonging effect, so long as it doesn’t go on too long.
The big pharmas are interested in this — Glaxo just acquired Sirtris for $750MM this week — a company that is commercializing resveratrol-analogs and related molecules.
What’s the big deal with resveratrol and why is Sirtris worth almost a billion dollars?