03/17/2026
Fasting influences the body's primary metabolic hormones:
- Insulin decreases
- Glucagon increases
These hormonal changes *can* help release stored fat, increase fatty acid oxidation, and improve metabolic flexibility.
But what are the differences (and risks) between men and women?
Men often show stronger improvements in metabolic markers during fasting, including reductions in blood glucose levels, and improved insulin sensitivity. Male s*x hormones may also help enhance the body's ability to regulate glucose metabolism.
Women's metabolic responses are often influenced by hormonal cycles, which can come with some fasting risks to be aware of.
Progesterone may increase glucose production, insulin sensitivity may fluctuate across the menstrual cycle, and estrogen also plays protective roles in blood vessel function and metabolic regulation.
Metabolism interacts with many biological systems like the immune system, vascular health, and hunger/regulation centers in the brain. Over time, disruptions in these systems can contribute to metabolic diseases such as type 2 diabetes.