Journal
Biomarker deep-dives, longevity science, and the research behind your Merios health score.
99 articles
Every article, by topic
Blood Tests15
- Blood Tests Without a Doctor: How to Order Your Own Labs (2026)
- Can You Drink Coffee Before a Blood Test?
- CBC Blood Test Results Explained: What Every Number Means
- Fasting Before a Blood Test: How Long, and What Breaks It
- Ferritin 15: Low, Normal, or Cause for Concern?
- Hematocrit Levels: Normal Range and What High or Low Means
- Hemoglobin 14 g/dL: Is This Normal?
- How Often Should You Get Blood Work? A Guide by Age and Condition
- How to Prepare for a Blood Test: The Complete Checklist
- How to Read Blood Test Results: A Step-by-Step Guide
- Is My Blood Test Result Bad? How to Tell What's Actually Urgent
- MCV and MCH on a Blood Test: What Low and High Values Mean
- Optimal vs Normal Blood Test Ranges: What the Difference Means
- White Blood Cell Count (WBC): Normal Range and What High or Low Means
- Your Blood Tests Are 'Normal' but You Feel Terrible: Here's the Gap
Biomarkers28
- 10 Longevity Biomarkers That Predict Lifespan (2026 Guide)
- 20 Most Important Blood Biomarkers Explained
- ALT 40: Is My Liver OK?
- ALT and AST High: What Elevated Liver Enzymes Actually Mean
- ApoB 90 mg/dL: Is That Optimal or Borderline?
- ApoB: Your Real Heart Risk Number (Not LDL) [2026 Guide]
- CAC Score: What Your Coronary Calcium Scan Really Means
- Cholesterol Ratio Calculator: Total/HDL, LDL/HDL and Triglyceride/HDL
- Creatinine 1.2: Is My Kidney Function OK?
- CRP Above 3 mg/L: What High hs-CRP Means for Your Heart
- CRP and Systemic Inflammation: What Elevated Inflammatory Markers Mean
- Cystatin C: The Kidney Test That's Better Than Creatinine
- Ferritin 30 ng/mL: Low Normal or Iron Deficient?
- GGT Levels High: What It Means Beyond Liver Disease
- High Homocysteine: What It Means for Your Heart and What Lowers It
- How to Lower Cholesterol Without Medication: 10 Evidence-Based Strategies
- How to Lower CRP Levels: 8 Strategies Compared
- Inflammation Markers in a Blood Test: hs-CRP, Homocysteine, Ferritin and More
- Iron Saturation (TSAT) vs Ferritin: Not the Same Test
- LDL 130 mg/dL: Borderline-High Cholesterol — What to Do
- Lp(a) High: The Genetic Heart Risk Factor You Can't Ignore
- Normal Hemoglobin, Exhausted Anyway? [Ferritin is the Answer]
- Oral Iron Supplements Not Working? Here's Why (and What to Do Instead)
- Statins: Side Effects, When They're Worth It, and When to Reconsider
- Total Cholesterol 220: Is This Too High?
- Triglycerides 180: What Should You Do?
- Triglycerides Above 150? Reverse It in 4 Weeks [Not With Fat]
- Why Is My LDL Cholesterol High Even Though I Eat Healthy?
Wearables & Lifestyle11
- Apple Watch HRV by Age: Typical Ranges and What Your Number Means
- Apple Watch Recovery HRV vs HRV, and the Readiness Score
- Apple Watch Sleep Tracking vs Oura Ring: Which Is More Accurate?
- Do You Need a CGM If You're Not Diabetic? What the Data Says
- How Accurate Is Apple Watch VO2 Max? What the Research Shows
- How to Combine Wearable Data With Blood Tests (2026)
- How to Increase Deep Sleep: 12 Science-Backed Strategies
- Recovery HRV vs Apple Watch HRV: Why the Numbers Differ
- Why Does My Heart Rate Spike While Sleeping?
- Why Is My Resting Heart Rate Suddenly High? 9 Common Causes
- Zone 2 Cardio: The Heart Rate Zone That Extends Your Life
Metabolic Health10
- Fasting Glucose 100 or 110 mg/dL: Borderline or Prediabetic?
- Fasting Insulin Levels Chart: Normal, Optimal and High Ranges
- GLP-1 Muscle Loss: What the Data Actually Shows (and the Peptide Question)
- HbA1c 5.6%: Normal — But One Step From Prediabetes
- HbA1c 5.7%, 5.8% or 6.0%: What Your Prediabetes Number Means
- HbA1c 6.5%: The Diabetes Threshold — What It Means and What to Do Next
- HOMA-IR: The Insulin Resistance Score Your Doctor Never Calculates
- How to Lower Your A1C Naturally (and How Fast It Can Drop)
- Type 2 Diabetes vs LADA: How Blood Tests Tell Them Apart
- Uric Acid Levels High: Why It Matters Way Beyond Gout
Longevity13
- Best Foods for Longevity: What to Actually Eat to Live Longer
- Best Longevity Apps 2026: Which Age Score Can You Trust?
- Biological Age Calculator: Estimate Your Age from Blood Tests [2026 Method]
- Biological Age vs Chronological Age: How to Measure How Fast You're Actually Aging
- Blood Test Results Normal Range Chart: Complete Reference Guide
- Brain Aging Biomarkers: Blood Tests That Predict Cognitive Decline
- How to Improve Your VO2 Max (Your Best Predictor of Lifespan)
- How to Lower Your Biological Age: What Actually Works
- Muscle and Longevity: Why Strength Predicts How Long You Live
- The 8 Best Blood Test Tracker Apps in 2026, Compared
- The Longevity Blood Panel: Which Tests to Actually Order (2026)
- Triglyceride to HDL Ratio Calculator: Formula, Chart and What Your Ratio Means
- What Blood Tests to Get Before Starting Supplements
Hormones9
- Anti-TPO Antibodies High: What It Means for Your Thyroid
- Free vs Total Testosterone: Why a Normal Result Can Still Feel Low
- Full Thyroid Panel: The Tests Beyond TSH and What They Show
- IGF-1 Levels: The Growth Factor That Helps You and Ages You
- Is YOUR Testosterone Low? Age-By-Age Reference [Calculator]
- Low Testosterone at 25-30: Causes, Symptoms, and What Your Blood Test Means
- SHBG High or Low: What It Means for Your Testosterone
- Testosterone 400, 450 or 500 ng/dL: Low or Normal?
- TSH 3.0 or 4.5 mIU/L: Normal or Too High? The Thyroid Gray Zone
Nutrition & Supplements14
- Boron Supplement: Effects on Testosterone, Estrogen, and Inflammation
- Does Coffee Break a Fast? What the Science Actually Says
- High Cortisol Symptoms: Signs Your Stress Is Showing Up in Your Blood Work
- Lactoferrin for Iron Absorption: Better Than Iron Supplements?
- Magnesium Deficiency in Women: Symptoms, Blood Tests, and What Actually Works
- Magnesium Types Compared: Which One Should You Actually Take?
- Omega-3 Index: The Blood Test That Predicts Heart Disease Better Than Cholesterol
- The Best Supplement Stack for Men: What the Blood Tests Actually Show
- Vitamin B12 300 pg/mL: Low or Normal?
- Vitamin D 30 ng/mL: Low Normal or Insufficient?
- Vitamin D and B12 Deficiency Together: Causes, Symptoms, and Treatment
- Vitamin D Deficiency: Your Doctor Probably Won't Fix It [2026]
- Vitamin D Level of 20 ng/mL: Is That Low Enough to Worry?
- Vitamin K2 and D3 Together: Why You Need Both (and What Happens If You Don't)