Hormones & Metabolism
Hormones are chemical messengers that regulate nearly every bodily function—from energy and mood to reproduction and aging. Understanding how to optimize hormonal health gives you leverage over vitality and longevity.
Major Hormonal Systems
Cortisol & the HPA Axis
The hypothalamus-pituitary-adrenal axis controls stress response:
- Healthy pattern: High morning spike, declining through day
- Unhealthy pattern: Flat or inverted (low morning, high evening)
- Morning light is the primary cortisol rhythm setter
Testosterone & the HPG Axis
The hypothalamus-pituitary-gonadal axis:
- Critical for both men and women (different amounts)
- Affects: Mood, energy, muscle, libido, confidence
- Natural optimization: Sleep, light, exercise, competition
Estrogen & Progesterone
Female reproductive hormones with brain-wide effects:
- Influence mood, cognition, bone health
- Cycle-dependent effects on energy and training response
Thyroid Hormones
Master metabolic regulators (T3, T4):
- Control basal metabolic rate
- Affect energy, weight, mood, cognition
- Require iodine and selenium
Growth Hormone
Released during deep sleep and intense exercise:
- Promotes tissue repair, fat metabolism
- Declines with age
- Enhanced by: Sleep, fasting, sauna, exercise
Insulin & Blood Glucose
The metabolic gatekeeper:
- Regulates blood sugar and fat storage
- Insulin sensitivity = metabolic health
- Improved by: Exercise, fasting, cold, muscle mass
Protocols for Hormonal Health
Light Protocol
| Time | Light | Effect |
|---|---|---|
| Morning (first hour) | Bright sunlight | Sets cortisol rhythm, supports testosterone |
| Daytime | Natural light exposure | Maintains circadian alignment |
| Evening | Dim, warm light | Allows melatonin rise |
| Night | Complete darkness | Supports growth hormone release |
Cold Exposure
- Increases norepinephrine (directly)
- May support testosterone (avoid immediately after resistance training)
- Activates brown fat, improves metabolic health
Resistance Training
- Acute testosterone and growth hormone increase
- Long-term improvements in insulin sensitivity
- Compound movements most effective
Time-Restricted Eating
Confining eating to a window (commonly 8-10 hours):
- Improves insulin sensitivity
- May increase growth hormone (during fasted periods)
- Supports circadian alignment
Heat Exposure
- Growth hormone increase (4x with 4 sessions of 30 min at 180°F)
- Heat shock proteins
- Cardiovascular benefits
Conditions Addressed
| Condition | Key Mechanisms | Protocols |
|---|---|---|
| Burnout | HPA axis dysfunction, cortisol | Rest, morning light, stress management |
| Low Testosterone | HPG axis, sleep, lifestyle | Sleep, light, exercise, body composition |
| Metabolic Dysfunction | Insulin resistance | Fasting, exercise, cold |
| Thyroid Issues | T3/T4 imbalance | Iodine, selenium, reduce stress |
Key Supplements
| Supplement | Mechanism | Notes |
|---|---|---|
| Ashwagandha | Cortisol modulation | Evidence for reducing chronic cortisol |
| Vitamin D | Hormone precursor | Test levels; many are deficient |
| Zinc | Testosterone synthesis | Required; don’t over-supplement |
| Magnesium | Hormone regulation, sleep | Most people benefit from supplementation |
| Boron | Free testosterone | Small but meaningful effect |
| Iodine | Thyroid function | From seafood or supplementation |
Behaviors That Disrupt Hormones
- Chronic sleep deprivation: Crashes testosterone, elevates cortisol
- Excessive alcohol: Suppresses testosterone, disrupts sleep
- Chronic stress: Cortisol dominance, HPA axis dysfunction
- Sedentary lifestyle: Insulin resistance, low growth hormone
- Excessive light at night: Suppresses melatonin, disrupts all downstream hormones
Related Foundations
- Sleep & Circadian Biology - Hormones are released during sleep
- Physical Performance - Exercise modulates hormones
- Mood & Mental Health - Hormones profoundly affect mood
Episodes
- Testosterone - Optimize testosterone naturally
- Estrogen - Female hormone optimization
- Growth Hormone - Maximizing GH naturally