What is the primary factor that determines muscle retention during a caloric deficit?
Natural cutting is predominantly influenced by your testosterone levels. When you create a caloric deficit, your body perceives it as a threat, triggering catabolic hormones like cortisol that can break down muscle tissue. The effectiveness of testosterone in protecting muscle fibers varies significantly among individuals, largely due to genetics.
✦
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 →