You are anathema to science and reading comprehension. You dismiss a quote from Harvard researchers. Then babble a little. Then you fail to realize a whole bunch of what you quote corroborates what I've been telling you. For example, those enzymes you mention, they're proteins. You know what dictates how a protein is made, right? A gene. The very genes you said didn't have anything to do with obesity. You pasted:
...weight is the complex combination of a mul ude of different metabolic processes, from brain systems that regulate appe e to enzymes that control how efficiently calories are turned from food into energy that the body needs.
Not only do you appear to be incapable of reading and understanding what I am writing and have written, you don't even appear to understand basic scientific principles you are attempting to use to bolster your side of the argument. You're disproving your own argument without even knowing it. A wise saying goes: "You should quit while you're ahead." However, in rare instances, you should not take old wisdom to heart. Here it presupposes, erroneously in your case, that you would ever be ahead. You, instead, should always strive to quit while you're behind. The earlier, the better.