You are overstating the benefits of fasting. While it can be an effective weight loss strategy for some people, for those of us at a healthy weight there is no reliable evidence that it will improve lifespan compared to eating the same nutrients spread out across multiple meals.

I'm a large man and fairly active so I have to consume ~3000 kcal/day to maintain weight. If I try to eat that much in one meal it will make me physically sick. My digestive system just can't handle that much in one bolus.