Evidence-based writing on weight loss, fitness, nutrition, body composition, sleep, blood-work, and AI health.
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.
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.
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.
Comparing the top AI fitness apps in 2026 — features, pricing, privacy, and which one is actually worth your time.
DEXA, calipers, smart scales, AI body scans — the 4 ways to measure body fat at home, with accuracy and cost.
Computer vision models can estimate body fat % from 2 phone photos. Here's how they work, accuracy, and the privacy story.
The three most popular intermittent fasting protocols, what the evidence actually says, and how to pick the right one for you.
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.
Photo-based AI calorie counters now rival MyFitnessPal's database for accuracy — and they're 10× faster. Side-by-side test.
Comparing the three most popular training splits — which is best for muscle gain, weight loss, and your schedule.
What HRV actually means, why deep sleep matters more than total sleep, and how recovery scores work — in plain English.
Vitamin D, ferritin, HbA1c, TSH, lipid panel — the 5 lab markers that catch the most preventable conditions early.
How AI skin analysis works, what metrics are reliable, and when to see a dermatologist instead.
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.
When to count calories, when to stop, and how to transition from tracking to intuitive eating without regaining weight.
The supplement industry is a $150B mess. These 5 supplements actually have strong evidence — and when (and when not) to take them.
Why PCOS makes weight loss harder, what actually works (insulin sensitivity is the lever), and a sustainable plan.
Cycle syncing is everywhere on TikTok. Here's what's evidence-based, what isn't, and a practical training framework.
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.
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.
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.
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.
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.
Cal AI scans calories. Zafit AI scans calories plus body composition, blood-work, skin and recovery — with Indian food, Hindi and Tamil support, free tier.
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.
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.