Extended cardio, especially done too often or done repetitively for years, your body will produce cortisol which will cause excess calories to more easily convert to fat.
Too Much Cortisol - A nodule (mass) in your adrenal gland or a tumor in the brain’s pituitary gland can trigger your body to make too much cortisol. This can cause a condition called Cushing syndrome. It can lead to rapid weight gain, skin that bruises easily, muscle weakness, diabetes, and many other health problems.
FreeinTX 1 points 1 week ago
Cortisol
He ain't 100% wrong, but he is 90+% wrong.
Extended cardio, especially done too often or done repetitively for years, your body will produce cortisol which will cause excess calories to more easily convert to fat.
https://www.webmd.com/a-to-z-guides/what-is-cortisol