I remember when I first started my ketogenic diet again, the weight loss at the beginning was very dramatic and at the time I was still finishing off my bottle of l-glutamine. taking about 5g per day.
Its unclear how much glutamine the rodents in this study were getting per kg of body weight since I don't have access to the full article. But I think that in general obesity is characterised by an upregulation of fat storage compared to fat oxidation gene's.
Taubes comment on obesity being a disorder of excess fat accumulation rather than a result of over-eating mirror's this theory.