I actually do a spiritual prayer and fasting every Monday. It has been for about a year. It helps me to press in with my prayers that day. When I started keto, i noticed the Monday's were easier. I had done 3 days with other friends a few times just to agree in prayer with them. I do intermittent fasting now. Eating from 2pm to 6pm. But find I'm not hungry later if I get my macros [calorie/protein/fat] right. That to me is the amazing part. I do not feel hungry.