You lose weight by reducing calories intake. That's well known and what the review, unsurprisingly, has shown.
Methods like intermittent fasting work by providing a framework that makes it easier for people to achieve that.
The problem with recuing calorie intake is that it can also lead to lethargy, where you burn even less calories, and reducing intake even more means you arent getting vital nutrients.
It’s not black and white though. The body does adapt and respond to just reducing calories in or fasting.
It’s better to do portion control, consume fiber and better calories, and exercise to increase metabolism.
That all balances the calories out side of the equation in ways where fasting itself won’t.
https://theconversation.com/its-time-to-bust-the-calories-in...
https://theconversation.com/is-weight-loss-as-simple-as-calo...