Q

What hormonal changes occur in a caloric deficit that affect muscle retention?

From 5 years of verified research · Vassili Sandqvist
A

In a caloric deficit, the hormonal environment shifts unfavorably for muscle retention, characterized by decreased testosterone and IGF-1, alongside increased cortisol and decreased leptin. This hormonal shift makes it more challenging to maintain muscle mass, especially at high training volumes and intensities.

This is one answer. The complete system — the psychology, the biology, and the method — is in the book.

Read The Willpower Lie →
Found an error? Let me know →