There are loads of PhD biochemists who regularly support nonsense like this to protect the flow of grant money. Sears has a bad habit of making claims and then not bothering to support them. IIRC, Michael Jacobson at CSPI is also a PhD. They belong together.
Not exactly the same thing as non-caloric, granted; but not all of the concern over what we are eating and drinking is necessarily a grasp for grant money, or liberal fear-mongering.
If you have concerns with Sears, please, post a link for me -- I've found the biochem in "The Zone Diet" to be legit.
Cheers!