This is pure garbage. Making an effort to live a better life does not always follow a linear trend. There will be times when some make progress and then revert. But it's entirely about your mindset and intense self-reflection. If one lives in a completely pleasure-inducing life, sure, eating every food under the sun seems better. Yet, a self-reflective person would realize the reasoning behind losing the weight in the first place and why they should continue to stay in that state. It's a paradigm shift in the mind that must happen to maintain the loss in weight. Not the reverse.