I advocate intermittent fasting also. I practiced CRON for three years but quit as I felt I was losing bone density and getting sarcopenia. Felt about the best I ever have however. Mental acuity being the most evident. I still fast one or two days occasionally-no food at all, water, black coffee. A sports med person I spoke with last week mentioned a study of 12 hr. fasts being effective in some way but I haven't looked for the research.