I've been worried about this as well. A lenghty Harvard blog post from 2018 indicates that a 8-hour 7am-3pm feeding period gave better health-related results th

I've been worried about this as well. A lenghty Harvard blog post from 2018 indicates that a 8-hour 7am-3pm feeding period gave better health-related results than an 12-hour 7am-7pm feeding period. In other words, 'timing is key': https://www.health.harvard.edu/blog/intermittent-fasting-surprising-update-2018062914156 https://www.health.harvard.edu/blog/intermittent-fasting-sur... Interestingly, the researcher doesn't discuss skipping breakfast. I've been skipping for several years with a somewhat uneasy feeling and a growing phobia for diabetes. I'll probably try the 3pm/7pm to 7am fast instead; maybe my body doesn't tolerate skipping breakfast as well as I would like it to.