Seems I have been doing it wrong. Not eating for 14-16 hours. Here’s the right way to do it!
https://news.usc.edu/135551/fasting-aging-dieting-and-when-you-should-eat-valter-longo/
(27 June 2024 Subsequent research reveals endocrine imbalances occur when you consistently go for longer than 12 hours without food.)