Intermittent fasting in ~some~ capacity is really important
The principal behind it is the cyclic behavior of catabolism and anabolism. That cyclic “clearing house” is unbelievably important from a metabolic/longevity perspective.
Generally, I think rules are good templates (16 hours no eating/8 hours of eating), but the real rule is this: if you’re hungry, eat. If you’re not hungry, don’t eat. I’d say 99/100 times that really does work.
There’s all sorts of reasons to make a concerted towards significant fasts, but I think generally people just want something they can stick to for the long term that will offer them some sense of flexibility but also give them results. Mess around with different time restrictions, but I think it ultimately gets back to only eating when you’re hungry.