The Xtinction Journal
Ultra-Processed Food and Focus: What a New Study Found
Higher ultra-processed food intake was linked to lower attention scores. What this snapshot can—and cannot—tell...
Read moreCan Four Weeks of Diet Change Shift Biological Age?
A four-week trial changed a biomarker-based age estimate. Why a change in a score is...
Read moreKeto, Mediterranean, or Low-Fat: What Changed When Weight Loss Was Equal?
Three diets, similar weight loss, different changes in liver fat and glucose measures. What a...
Read moreFailure, Machines, and Periodization: What the 2026 ACSM Review Found
Do you need to train to failure or follow a complex program? A closer look...
Read moreHow Much Strength Training Is Linked to a Longer Life?
A long-term study linked weekly strength training with mortality. Here is what it found, and...
Read moreL-Theanine + caffeine: what focus studies show
Supplement Science · INGREDIENT ANALYSISThe Xtinction Journal · September 8, 2026 · Draft · 3...
Read moreCaffeine: performance without the hype
Supplement Science · INGREDIENT ANALYSISThe Xtinction Journal · September 8, 2026 · Draft · 3...
Read moreL-Citrulline: Beyond the Pump
Supplement Science · INGREDIENT ANALYSISThe Xtinction Journal · September 8, 2026 · Draft · 2...
Read moreRecovery & Habits
Getting Healthier: Five Habits to Build Before Buying Supplements
Five practical habits for eating well, moving more, and making progress that lasts.
Read moreRecovery & Habits
Strength Training for Beginners: How to Build a Sustainable Routine
What the 2026 ACSM update means for your first strength-training routine.
Read moreRecovery & Habits
How to Read a Nutrition Headline Without Getting Misled
A practical checklist for separating a promising finding from an exaggerated claim.
Read moreRecovery & Habits
Does Your Recovery Routine Start With Enough Sleep?
How sleep affects your training, and where to start if you need more rest.
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