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Cortisol is a mobilization hormone. And when it's released acutely and not chronically it does help with fat loss....

Cortisol is a mobilization hormone. And when it's released acutely and not chronically it does help with fat loss. 🙏🏻

However, if it stays elevated chronically it can hurt your fat loss efforts. How? Mostly by reducing the conversion of the T4 thyroid hormone to the T3 thyroid hormone. The more T3 you have, the higher your metabolic rate will be and the easier it'll be to lose fat.
Chronic cortisol elevation decreases the conversion of T4 into T3. And that's how it can decrease metabolic rate over time.
That's important for natural lifters because if you use a form of dieting (and training) that leads to excessively high levels of cortisol, you run the risk of slowing down your fat loss efforts in the long run.
Too Few Calories and Carbs
Excessive caloric deficits can lead to chronic cortisol elevation, and so does complete deprivation of carbs.
Think about it. Cortisol's first function is maintaining a stable blood sugar level. So when blood sugar drops down (when carbs or calories are too low) cortisol and glucagon are released to bring it back up. Cortisol is also released to mobilize other fuel sources.
So the greater the caloric deficit, and the lower the carbs, the more you risk increasing cortisol

Eating plenty of foods rich in Zinc and Selenium to increase your T3 Naturally.
Foods rich in zinc: oysters, beef, crab, pumpkin seeds, cashews, and chickpeas.
Foods rich in selenium: brazil nuts, tuna, halibut, sardines, turkey, and beef liver.

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