Oh goodness me. Without going into the numbers (single digit groups!?!), a "treatment" that, to me anyway, sounds like simulated seasickness caused people to lose weight?
Stick any randomly chosen group of fatties ("median BMI of 33.8 (range 25.4 to 50.2)"*) on a sea trip on a small trawler and see who doesn't lose weight, either from doing some useful work or from 'cookie tossing'.
Ye gods, I know that us more, ahem, generously proportioned individuals would like to find an easy way to lose weight but surely there's a better way than what is, for better or worse, basically induced seasickness.
*Your author, no sylph, is probably at the bottom end of those BMI figures.