The Pontzer 2021 paper changed everything. Your daily energy expenditure is basically flat from age 20 to 60. What changes is fat redistribution — driven by estrogen drop, cortisol elevation, muscle loss, and the alcohol cliff. Here is the four-lever protocol.
Pontzer 2021 (Science) measured 6,421 people, ages 8 days to 95 years. Daily energy expenditure stays flat 20 to 60. The "metabolism crashed" story is wrong. What changes is fat redistribution — estrogen drop, cortisol elevation, muscle loss. Four levers move it.
Read the cover story →The 3-4 follow-up articles that go deepest on your situation.
Sleep + protein floor + resistance + alcohol below 4/week. Target ranges. 12-week trajectory.
Why one drink hits harder. Why "moderate drinking is heart-healthy" was wrong methodology.
The biggest metabolism study ever done. Why your trainer's "metabolism slows at 40" claim is contradicted by 6,421 doubly-labeled water measurements.
The protein floor, the resistance protocol, the alcohol cliff, the sleep multiplier.
Each product is something we have read the trials on or personally used. Evidence note included. Some links are affiliate — disclosed on every CTA. No supplement-brand sponsorships, ever.
The metabolic-hormonal axis intervention with peer-reviewed bitter-orange research. The editor's 60-day test showed 1.8 inches off the waist on the same exercise and macros — that's the visceral fat lever in action.
Sleep architecture tracking matters more than calorie tracking at 50. The Pontzer math says you cannot out-eat sleep debt. Oura quantifies the variable that actually moves the needle.
Hitting the 0.8g/lb protein floor at every meal is the single biggest body comp lever after sleep. Momentous is NSF Certified for Sport (third-party tested for purity) and the protein source most professional athletes and clinicians recommend.
Calculators for the second-act decade — HRT readiness, Roth conversion year, claim-age optimizer. More tools coming including a protein-floor calculator and visceral fat tracker.
Open the tool →7 modules — what changed in your sleep at 45, the bedroom audit, the bedtime protocol, the morning anchor, 3am troubleshooting, hormone-aware modifications, and long-term maintenance. Sleep is the body comp lever.
See the course →The Sunday letters most relevant to your stated concern. Free, sent weekly, reply to anything.
One long-form research-led piece every Sunday. Free forever. Reply to anything — Alexander reads every response.