Gut Health Biomarkers

Tracking my gut biomarkers across 2.5 years of fasting – including results from my 7-, 9-, and 10-day water fasts.

The end of the 10-day fast - Sep 4, 2025

After 40 days of refeeding - Oct 14, 2025

Cortisol

Cortisol, µg/dL

  • Jan 27, 2023 - 14

  • Jun 30, 2023 - 13.7

  • Dec 17, 2024 - 10.8

  • Feb 11, 2025 (9-day fast) - 14.1

  • May 27, 2025 - 8.5

  • Sep 4, 2025 (10-day fast) - 18.5

  • Oct 14, 2025 - 10.8

Glucose

Glucose, mg/dL

  • Jan 27, 2023 - 88

  • Jun 30, 2023 - 89

  • Dec 17, 2024 - 88

  • Feb 11, 2025 (9-day fast) - 64

  • Sep 4, 2025 (10-day fast) - 63

  • Oct 14, 2025 - 88

HDL Cholesterol

HDL Cholesterol, mg/dL

  • Jan 27, 2023 - 71

  • Jun 30, 2023 - 75

  • Dec 17, 2024 - 88

  • Feb 11, 2025 (9-day fast) - 54

  • May 27, 2025 - 83

  • Sep 4, 2025 (10-day fast) - 50

  • Oct 14, 2025 - 71

HbA1c

HbA1c, %

  • Jan 27, 2023 - 5.5

  • Jun 30, 2023 - 5.5

  • Dec 17, 2024 - 5.5

  • Feb 11, 2025 (9-day fast) - 5.3

  • Sep 4, 2025 (10-day fast) - 5.3

  • Oct 14, 2025 - 5.4

hsCRP

hsCRP, mg/L

  • Jan 27, 2023 - 0.3

  • Jun 30, 2023 - 0.3

  • Dec 17, 2024 - 0.2

  • Feb 11, 2025 (9-day fast) - 0.2

  • May 27, 2025 - 0.2

  • Sep 4, 2025 (10-day fast) - 0.2

  • Oct 14, 2025 - 0.3

Triglycerides

Triglycerides, mg/dL

  • Jan 27, 2023 - 41

  • Jun 30, 2023 - 37

  • Dec 17, 2024 - 44

  • Feb 11, 2025 (9-day fast) - 108

  • May 27, 2025 - 42

  • Sep 4, 2025 (10-day fast) - 163

  • Oct 14, 2025 - 44