Real guides. No fluff.
Evidence-based writing on weight loss, fitness, nutrition, body composition, sleep, blood-work, and AI health.
How Many Calories Should You Eat to Lose 1 kg in a Week?
The exact calorie deficit to lose 1 kg per week — including a sustainable cap, how to calculate yours, and why most apps get it wrong.
How to Calculate Your BMR (Basal Metabolic Rate) — With Examples
BMR is the calories your body burns at complete rest. Here's the Mifflin-St Jeor formula, examples for different ages and weights, and how Zafit uses it.
TDEE Explained: How Many Calories You Actually Burn in a Day
Total Daily Energy Expenditure (TDEE) is the calorie target that matters. Here's how to calculate it, the activity multiplier table, and why most people overestimate.
Best AI Fitness Apps in 2026 — Honest Comparison
Comparing the top AI fitness apps in 2026 — features, pricing, privacy, and which one is actually worth your time.
How to Measure Body Fat Percentage at Home (4 Methods Compared)
DEXA, calipers, smart scales, AI body scans — the 4 ways to measure body fat at home, with accuracy and cost.
How AI Body Scans Work — Phone Camera Body Composition Explained
Computer vision models can estimate body fat % from 2 phone photos. Here's how they work, accuracy, and the privacy story.
Intermittent Fasting for Weight Loss: 16/8 vs 18/6 vs 20/4
The three most popular intermittent fasting protocols, what the evidence actually says, and how to pick the right one for you.
The Science of Sustainable Weight Loss (Why Most Diets Fail)
Why 80% of weight-loss diets fail within 2 years, what the long-term studies actually show, and the 5 levers that make weight loss stick.
AI Meal Scanners vs MyFitnessPal: Which Is More Accurate in 2026?
Photo-based AI calorie counters now rival MyFitnessPal's database for accuracy — and they're 10× faster. Side-by-side test.
Push/Pull/Legs vs Upper/Lower vs Full-Body: Which Split Is Best?
Comparing the three most popular training splits — which is best for muscle gain, weight loss, and your schedule.
Sleep Tracking 101: HRV, REM, Recovery Scores Decoded
What HRV actually means, why deep sleep matters more than total sleep, and how recovery scores work — in plain English.
5 Blood-Work Markers Every Adult Should Know (And What Yours Mean)
Vitamin D, ferritin, HbA1c, TSH, lipid panel — the 5 lab markers that catch the most preventable conditions early.
AI Skin Analysis: What It Can — and Can't — Tell You
How AI skin analysis works, what metrics are reliable, and when to see a dermatologist instead.
AI Voice Doctors: Are They Safe? When to Use Them, When Not To
Voice consults with AI specialists are now sub-second. Here's what they're good for, what they aren't, and how to use them safely.
Calorie Counting vs Intuitive Eating: Which Works for Weight Loss?
When to count calories, when to stop, and how to transition from tracking to intuitive eating without regaining weight.
The Only 5 Supplements With Strong Evidence (and Who Should Take Them)
The supplement industry is a $150B mess. These 5 supplements actually have strong evidence — and when (and when not) to take them.
PCOS and Weight Loss: A Practical Nutrition + Training Guide
Why PCOS makes weight loss harder, what actually works (insulin sensitivity is the lever), and a sustainable plan.
Cycle Syncing Your Workouts: What the Research Actually Says
Cycle syncing is everywhere on TikTok. Here's what's evidence-based, what isn't, and a practical training framework.
PHQ-9 and GAD-7 Explained: The 2 Mental Health Screeners Everyone Should Know
PHQ-9 (depression) and GAD-7 (anxiety) are 5-minute self-assessments your doctor uses. Here's how to score yours and what the numbers mean.
Why One Health App Beats Fifteen (The Case for a Unified Stack)
The average person uses 12+ health apps. None of them talk to each other. Here's why that's broken and what a unified stack actually delivers.
Zafit AI vs Whoop: Better Than a $239/yr Wearable in 2026?
Whoop charges $239/year and locks you into a strap. Zafit delivers recovery, strain, HRV and sleep on the phone you already own. Honest 2026 comparison.
Zafit AI vs Oura Ring: AI Health Without a $300 Ring
Oura needs a $300+ ring plus a $5.99/month subscription. Zafit gives you sleep, readiness and HRV on the phone you already own. Full 2026 comparison.
Zafit AI vs Apple Fitness+: Beyond Workout Videos
Apple Fitness+ is $9.99/month for workout videos and an Apple ecosystem lock-in. Zafit AI is a full health intelligence platform. Honest 2026 comparison.
Zafit AI vs Cal AI: The Alternative That Does More
Cal AI scans calories. Zafit AI scans calories plus body composition, blood-work, skin and recovery — with a free tier.
Zafit AI vs Noom: Stop Paying $70/mo for Psychology Lessons
Noom charges up to $70/month for daily psychology lessons and manual food logging. Zafit AI delivers an adaptive plan with AI doing the work — free to start.
Zafit AI vs Fitbit Premium: No Bracelet Required
Fitbit Premium needs a $100+ bracelet plus $9.99/month and locks your data inside Google. Zafit AI runs on your phone, free to start. Honest 2026 comparison.