https://fasttime.io/ 2026-05-01 weekly 1.0 https://d2xsxph8kpxj0f.cloudfront.net/310519663540679266/5PqGgd8gYvwm6QmcuUeXCn/hero-bg-2ifbCKSJCKRKNyUwDkPCqd.png 56 vs 72 Hour Fast: Science-Backed Comparison Guide Cellular biology visualization representing the science of extended fasting — 56 vs 72 hours https://fasttime.io/about 2026-05-01 monthly 0.7 https://fasttime.io/community 2026-05-08 daily 0.8 https://fasttime.io/research 2026-05-08 monthly 0.9 https://fasttime.io/research/56-hour-fast-protocol 2026-05-08 monthly 0.9 https://fasttime.io/research/glucose-ketone-index 2026-05-08 monthly 0.85 https://fasttime.io/research/72-hour-fast-immune-reset 2026-05-08 monthly 0.9 https://fasttime.io/research/hgh-fasting 2026-05-08 monthly 0.85