Pretty much every fad diet is based on pseudoscience and intermittent fasting is no exception. The only one I know of which has any real factual basis is that a strict Keto diet can be useful in managing and mitigating early stages of Diabetes.
The main thing for weight loss is always calories in < calories out and always has been and always will be. Any particular diet is only useful for you if it helps you prrsonally maintain a calorie deficit.
Some people have success with intermittent fasting because it helps them control their calories intake. Others have success with grazing because it helps them manage feelings of hunger etc.
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