This meme is wrong and demonstrates a deep ignorance about nutrition and diets. I hate fat fucks as much as the next guy. Obviously if they were more intelligent they would not be fat. But these diets all do more than reduce calories. Intermittent fasting in particular does not attempt to reduce calories. You are supposed to eat just as manny callories during the 8 hour window as you would otherwise. If you don't eat as much that is incidental. The diet is supposed to work without a deficite. Most diets try to leverage some quirk of human biology to get a weight loss effect greater than simply cutting callories. Some simply try to make it easier to cut callories by tricking the body into thinking you ate more, others try to cut out a link in the chain of fat storage so you shit out more nutrients. Different people have different sensitivity to all these factors so diets vary in effectiveness. Cutting calories works for everyone, but you can do better by understanding a little but about biology. Work smarter, not harder.