05/25/2026
The Truth About Metabolism After 40
Most men think their metabolism is “broken.”
But usually, it’s years of lifestyle habits adding up.
1. Lower Muscle Mass
After 30, adults naturally begin losing 3%-8% muscle mass every decade, especially without strength training.
Less muscle can mean:
• Lower calorie expenditure
• Lower energy
• Worse body composition
2. Lower Bone Density
Both men and women gradually lose .5-1% bone density after 30, especially with a sedentary lifestyle and lack of resistance training.
Women often experience an even sharper decline after menopause.
Strength training helps stimulate and grow both muscle and bone density as you age.
3. Sedentary Lifestyle
Most people move far less as they get older.
Less movement =
• fewer calories burned
• bad lungs/heart/arteries = lower energy
• poorer overall health
Walking 8-10k steps a day and regular activity matter more than most people realize.
4. Uncontrolled Eating
Stress eating, snacking, liquid calories, and inconsistent habits slowly add up over time.
Most people don’t have a broken metabolism.
They have unsupported habits.
The good news?
Your body can still change after 40.
Build muscle.
Build bone density.
Move daily.
Eat better.
Stay consistent.
That’s still the foundation.
If you want help or to get pointed in the right direction comment or message me “fit”
— Zion’s Strength