No the FDA can't stop him from publishing. They are the Food and Drug
Administration. They can however stop him from selling medicine and quack
cures and thats what they did. He used to sell stuff that only cured his
cash flow and they stopped him doing that so he changed to selling books
touting cures which is protected under free speech laws instead. Kevin
Trudeau is a dangerous quack but most web sites, even stupid ones, are
protected under free speech provisions as well unless he steps over very
specific lines.

----------------------Copied from Salon website --
July 26, 2005  |  Many a late-night channel surfer has been numbed to sleep
by endless infomercials hawking ab machines, penis enlargers, psychic
readings and baldness cures. But how about a 30-minute faux talk show
featuring a slick "expert author" who promises natural cures for cancer,
diabetes and chronic fatigue syndrome and who claims that the FDA, drug
companies and food industry have withheld such cures from the public in
order to keep making bigger and bigger profits?
Step right up folks, and tune in to the paranoid world of master huckster
Kevin Trudeau, whose book "Natural Cures 'They' Don't Want You to Know
About" climbed to the top spot on the New York Times bestseller list for
advice titles last weekend. The Federal Trade Commission virtually banned
Trudeau from the airwaves last year in an attempt to "shut down an
infomercial empire that has misled American consumers for years." But by
shifting his business model from selling supposed cure-all products to
peddling books, which are protected by the First Amendment, Trudeau has been
able to slip past federal regulators and continue to sell snake oil to the
masses -- first through his infomercial and now via mainstream book
retailers like Amazon.com and Barnes & Noble.
http://www.salon.com/books/feature/2005/07/29/trudeau/index_np.htm
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Federal Trade Commission settlement with Kevin Trudeau - a prolific marketer
who has either appeared in or produced hundreds of infomercials - broadly
bans him from appearing in, producing, or disseminating future infomercials
that advertise any type of product, service, or program to the public,
except for truthful infomercials for informational publications. In
addition, Trudeau cannot make disease or health benefits claims for any type
of product, service, or program in any advertising, including print, radio,
Internet, television, and direct mail solicitations, regardless of the
format and duration. Trudeau agreed to these prohibitions and to pay the FTC
$2 million to settle charges that he falsely claimed that a coral calcium
product can cure cancer and other serious diseases and that a purported
analgesic called Biotape can permanently cure or relieve severe pain.
http://www.ftc.gov/opa/2004/09/trudeaucoral.htm