Well, before getting too excited you may want to consider that what worked in one experiment may be a bad thing in the aggregate. Even if you could repeatedly and reliably fool your brain into thinking you drank something with calories in it, the subsequent draw on your body that did not actually get the calories could actually end up being a bad thing. You could end up with the crash-to-end-all-crashes.

(Whether or not you could sustain that illusion depends on how deep in the brain it is. If it's a learned response that comes from years of exercise, you might unlearn it very quickly. If it's actually a previously-unidentified instinct, you might actually be able to do it for a long time before the hindbrain got wise. This is speculation, of course.)