All I did was go back from standard American feeding window to a 14/10 window. I stop eating at 7PMish and eat again after 10AM. I've seen studies that show 1

All I did was go back from standard American feeding window to a 14/10 window. I stop eating at 7PMish and eat again after 10AM. I've seen studies that show 14/10 is about as good as 16/8. How long did you try eTRF? It takes time to adapt. Ultimately your body needs to up regulate ketone production or you will feel tired because you really don't have enough energy. Lots of fast carbs will spike insulin and suppress ketone production if you are hyperinsulinemic.