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Cardiologist Lists Key Metabolic Health Markers to Track After 40

Cardiologist Afshine Emrani outlines blood markers he tracks beyond standard physicals, including fasting insulin, HOMA-IR, HbA1c, triglyceride-to-HDL ratio and ApoB, with target ranges for each. The post argues these tests detect metabolic decline years earlier than typical panels.

Original post ยท 6 min read
I'm a cardiologist. After 40, stop guessing about your health. These numbers tell you whether you're building a long, vibrant life โ€” or quietly declining without knowing it.

I run these on myself. I run them on every patient I care about. Most are cheap bloodwork. All are available now. And together, they paint a picture no standard annual physical will ever give you. Print this. Bring it to your next appointment. Your 60-year-old self will thank you.
๊Ÿท๊Ÿท๊Ÿท
๐—™๐—ฎ๐˜€๐˜๐—ถ๐—ป๐—ด ๐—œ๐—ป๐˜€๐˜‚๐—น๐—ถ๐—ป
Target: below 5 ฮผIU/mL. Ideal: 3-4.
This is the 10-year warning bell your standard panel completely misses. Your glucose and A1c can look "normal" for a decade while your pancreas is working overtime to keep them there. Fasting insulin catches insulin resistance 5-10 years before your A1c moves. By the time A1c rises, the damage is already extensive.

๐—›๐—ข๐— ๐—”-๐—œ๐—ฅ
Target: below 1.0.
Calculated from fasting insulin and fasting glucose. The single best measure of insulin sensitivity. Above 1.0 and your metabolism is already under strain. Above 2.5 and you're insulin resistant โ€” even if every other number looks fine.

๐—›๐—ฏ๐—”๐Ÿญ๐—ฐ
Target: below 5.4%.
Not below 5.7% โ€” that's the threshold where medicine calls you "prediabetic." By then you've been metabolically compromised for years. Optimal is below 5.4%. Blood sugar mastery is longevity mastery.

๐—ง๐—ฟ๐—ถ๐—ด๐—น๐˜†๐—ฐ๐—ฒ๐—ฟ๐—ถ๐—ฑ๐—ฒ : ๐—›๐——๐—Ÿ ๐—ฅ๐—ฎ๐˜๐—ถ๐—ผ
Target: below 2. Ideal: below 1.
Your metabolic health crystal ball. This ratio predicts insulin resistance, cardiovascular risk, and metabolic syndrome better than any single lipid number alone. A ratio above 3.5 is a red flag regardless of what your total cholesterol says.

๐—”๐—ฝ๐—ผ๐—•
Target: below 80 mg/dL for moderate risk. Below 60 for high risk.
I've written about this extensively. ApoB counts every atherogenic particle hitting your artery walls. A 2024 analysis found 54% of patients had dangerous levels that standard LDL testing completely missed. If you only know your LDL, you're driving with one eye closed.

๐—Ÿ๐—ฝ(๐—ฎ)
Test once in your lifetime.
100% genetic. 1 in 5 Americans are elevated. Triples heart attack risk independently of everything else on this list. Diet and exercise cannot lower it. The 2026 ACC/AHA guidelines now recommend everyone be tested. Most never have been.

๐—ต๐˜€-๐—–๐—ฅ๐—ฃ
Target: below 1.0 mg/L.
You can have perfect cholesterol and inflamed arteries silently preparing to rupture. hs-CRP measures the fire behind the plaque. The JUPITER trial proved that finding and treating inflammation saves lives โ€” even when lipids look fine. If this number is elevated, your mouth, your gut, your metabolic health, and your visceral fat are the first places to investigate.

๐—ฉ๐—ถ๐˜๐—ฎ๐—บ๐—ถ๐—ป ๐——
Target: 50-80 ng/mL.
Not the bare minimum of 30 your doctor accepts. Suboptimal vitamin D is linked to higher inflammation, weaker immunity, increased cardiovascular events, worse mood, and poorer outcomes across nearly every disease I treat. Supplement D3 with K2 โ€” without K2, calcium deposits in your arteries instead of your bones.

๐—ง๐—ฒ๐˜€๐˜๐—ผ๐˜€๐˜๐—ฒ๐—ฟ๐—ผ๐—ป๐—ฒ (๐—ง๐—ผ๐˜๐—ฎ๐—น + ๐—™๐—ฟ๐—ฒ๐—ฒ)
Men: optimal range 600-1000+ ng/dL total.
Declining testosterone is an independent predictor of cardiovascular death in men. It's tied to insulin resistance, arterial stiffness, visceral fat accumulation, and systemic inflammation. DHEA-S drops 10-20% every decade after 30. Tracking these isn't about vanity โ€” it's evaluating your body's systemic resilience.

๐—•๐—น๐—ผ๐—ผ๐—ฑ ๐—ฃ๐—ฟ๐—ฒ๐˜€๐˜€๐˜‚๐—ฟ๐—ฒ
Target: below 120/80. Aim closer to 110/70.
Every point above optimal is cumulative arterial damage. Buy a home cuff. Measure morning and evening, seated quietly for five minutes, arm at heart level. White-coat readings in the office miss what's really happening. The smartest $40 investment in cardiac self-care.

๐—ฉ๐—ข๐Ÿฎ ๐— ๐—ฎ๐˜…
Men over 40: above 40 mL/kg/min. Women over 40: above 35.
Cardiorespiratory fitness is the single strongest predictor of all-cause mortality โ€” stronger than smoking, diabetes, or heart disease as individual risk factors. A landmark study in JAMA found that extreme fitness was associated with the lowest mortality with no upper limit of benefit. You can estimate VO2 max with a timed mile, a rower test, or a wearable. Get faster every year.

๐—ก๐˜‚๐—บ๐—ฏ๐—ฒ๐—ฟ ๐—ผ๐—ณ ๐— ๐—ฒ๐—ฑ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€
Target: as few as possible.
Every medication you're on should be earning its place. I just wrote about five commonly prescribed drugs that do more harm than good with long-term use. Bring your full medication list to every appointment. Ask: "Do I still need this?" Deprescribing is one of the most powerful and underused tools in medicine.
๊Ÿท๊Ÿท๊Ÿท

Thirteen numbers. Most available through cheap bloodwork and simple tests. Get them once or twice a year. Here's what I want you to understand: these numbers don't just tell you where you are. They tell you where you're heading. A fasting insulin of 8 today becomes diabetes in five years. An ApoB of 120 today becomes a heart attack in ten. An hs-CRP of 3 today means your arteries are inflamed right now โ€” regardless of how healthy you feel. The standard annual physical checks a fraction of these. It was designed to find disease that's already there. This panel finds the disease that's coming โ€” years before it arrives.

What gets measured gets improved. Optimize with the foundation I write about every week on this platform:
Zone 2 cardio plus resistance training 3-4 times per week. High-protein whole-food nutrition. Sleep 7-9 hours โ€” non-negotiable. Morning sunlight. Stress management. And the targeted supplements I've covered in detail โ€” creatine, magnesium, CoQ10, D3+K2, glycine, omega-3, psyllium husk.
The breakthroughs coming in the next decade โ€” gene editing for cholesterol, cellular reprogramming, senolytics that clear senescent "zombie" cells driving inflammation and aging, GLP-1 drugs rewriting metabolic medicine โ€” will be most powerful for people who've already built the metabolic foundation to receive them.

The future of medicine is personalized. But it starts with knowing your numbers today. Print this list. Book the bloodwork. Own the data. Prevention isn't passive. It's the most aggressive thing you can do for the decades ahead.
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More in Science & Health

U.S. Government, Google and Meta Launch $1.8 Billion AI Biology Data Effort

U.S. Government, Google and Meta Launch $1.8 Billion AI Biology Data Effortโ–ถ

Molly O'Shea reports a $1.8 billion coalition including Biohub, the Department of Energy, NIH, Meta, Google DeepMind and Isomorphic Labs to build the largest open, AI-ready biological dataset to help models predict biology and treat disease.

Original post ยท 1 min read
BREAKING: The U.S. government, Google, Meta & Zuckerberg-backed @biohub are launching a $1.8B push to build the data layer for AI biology.

The goal is to create the largest open, AI-ready biological dataset ever assembled, giving models the data needed to better predict how biology works & ultimately help treat disease.

The coalition is massive:

โ€บ Biohub committed $500M
โ€บ DOE is investing $500M+ across measurement, modeling & compute
โ€บ NIH is bringing $500M+ of federally funded datasets & repositories
โ€บ Meta, Google DeepMind & @IsomorphicLabs are jointly investing another $300M

This is effectively an infrastructure buildout for AI biology.

Instead of just building bigger models, theyโ€™re attacking one of the biggest bottlenecks in biology AI today, generating standardized, high-quality biological data at massive scale & making it openly available to researchers.

$1.8B committed to turning biology into something AI can increasingly model, predict & engineer.
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FDA Clears First Human Age-Reversal Trial From Life Biosciences

FDA Clears First Human Age-Reversal Trial From Life Biosciencesโ–ถ

Vaibhav Sisinty reports the FDA cleared the first human age-reversal trial, citing animal research on partial reprogramming and Life Biosciences' $80 million raise to pursue it, though the post's claims about mouse and monkey results are not independently verified.

Original post ยท 1 min read
This is insane ๐Ÿ”ฅ

The FDA cleared the first human age-reversal trial

A Harvard professor proved you can reverse aging by 75% in 6 weeks in mice cured blindness, reversed Alzheimer's, MS, ALS, kidney and liver disease then confirmed it works in monkeys

Now humans are next. Life Biosciences raised $80M to make it happen

His words "The eye is just the beginning. We believe we can treat every tissue. A whole body reset"
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Evidence API Lets Users Search 100M Papers for Scientific Claims

Evidence API Lets Users Search 100M Papers for Scientific Claimsโ–ถ

James Zou announces the Evidence API from Paperclip, which lets users search over 100 million papers to find evidence for and against a scientific claim in about a second. He cites coffee and diabetes risk as an example query.

Original post ยท 1 min read
What if,
for any scientific claim,
you can search 100M+ papers to find the strongest evidence for and against it
โšก๏ธin 1 second?

Thatโ€™s now possible with Evidence API! ๐Ÿš€
paperclip.gxl.ai/evidence-api

For example, does drinking coffee reduce diabetes risk?
paperclip.gxl.aiPaperclipPaperclip โ€” search, read, and analyze 11M+ biomedical papers, regulatory documents, clinical trials, and biological databases (UniProt, PDB, ChEMBL) from the co
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Phone-Free Trial Shows Gains in Attention and Depression Symptoms

Noah Smith shares a post by Brandon Luu, MD, reporting that two weeks without phone internet improved sustained attention by an effect size comparable to about ten years of aging and reduced depression symptoms more than the average antidepressant effect.

Original post ยท 1 min read
Putting down your phone is more effective than antidepressants
Brandon Luu, MD @BrandonLuuMD
After blocking phone internet for 2 weeks:

1) Sustained attention improved by an effect size comparable to ~10 years of aging

2) Depression symptoms improved more than the average antidepressant effect
โ™ฅ 1.4K ยท โŸฒ 137 ยท ๐Ÿ‘ 94.9KView on X โ†—

Randomized Trial Finds Plain Water Gargling Cuts Respiratory Infections

Randomized Trial Finds Plain Water Gargling Cuts Respiratory Infections

Brandon Luu, MD, highlights a randomized trial in which gargling with plain water three times daily reduced upper respiratory infections by about 36%. He describes it as one of the cheapest cold-prevention interventions.

Original post ยท 1 min read
One of the cheapest cold-prevention interventions Iโ€™ve seen:

Gargling with plain water 3x/day reduced upper respiratory infections by ~36% in a randomized trial.
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Anduril and Palmer Luckey Win Wildfire XPRIZE for Rapid Fire Detection

Palmer Luckey says Anduril won the Wildfire XPRIZE for detecting and suppressing a wildfire within 10 minutes of ignition. He argues that even small gains could save the U.S. roughly $500 billion a year lost to wildfires.

Original post ยท 1 min read
Thanks, Peter! This is the beginning of the end for destructive wildfires. In a country that loses ~$500B every year to wildfires, even tiny gains make for huge savings, to say nothing of the incalculable value of lives and homes.
Peter H. Diamandis, MD @PeterDiamandis
Congrats to @PalmerLuckey and Anduril for winning the Wildfire XPRIZE - for detecting and suppressing a wildfire within 10 minutes of ignition!
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