> But if tou have one engine going downhill and another engine going uphill they are going to be burning different amounts of energy. Yes. The goal is to maint

> But if tou have one engine going downhill and another engine going uphill they are going to be burning different amounts of energy. Yes. The goal is to maintain a particular speed. > so having a method to make sure obese people don't have the fat-encoiraging flora and do have the thin-encouraging flora at least gives people a fighting chance. Sure, I think that's a very promising line of research that may make it easier for many people to modify their appetites. But for any given gut flora, the basic logic still holds. Just as for any given steam engine, the Watt governor works on the same principle.