It's that cut and dry. Any fad diet you adhere to for the moment, (Keto, Intermittent fasting, Paleo, Weight-watchers, Bernstein, etc.) will work temporarily. How many people have tried these, lost weight because they achieved their goal or perhaps didn't, but gained all the weight back? Millions or billions? I know I have- I have tried all kinds of "diets" in general. What worked? When I changed my mind, or when you change your mind.