Health & Body-Metric Articles

BMI & body weight

Read your BMI in context - and know when it misleads.

What BMI Do You Need for Weight-Loss Medication or Surgery?

The BMI thresholds guidelines use for medication (30, or 27 with a condition) and surgery (40, or 35) - and why the number is only the start.

Average BMI by Age and Gender: What the Numbers Really Show

How average adult BMI shifts from your twenties into older age, how men and women compare, and why 'average' is not the same as 'healthy'.

BMI Myths vs Facts: 9 Things Almost Everyone Gets Wrong

Does muscle weigh more than fat? Is a normal BMI always healthy? Nine common myths, each paired with what the evidence says.

How to Calculate Your BMI by Hand (Metric and Imperial)

The BMI formula in plain words, step-by-step for kg and pounds, two fully worked examples, and the small mistakes that throw it off.

Normal Weight but High Body Fat: The 'Skinny Fat' Puzzle

How you can have a healthy BMI and still carry too much fat and too little muscle - what 'skinny fat' means, why it happens, and how to spot it.

How Your BMI Changes With Age (and Why the Number Can Mislead)

Muscle loss, fat that migrates to your middle, and shrinking height all bend BMI as you age. What changes decade by decade - and what to watch instead.

Does BMI Affect Life Insurance? How the Numbers Change Your Premium

Insurers turn your height and weight into a BMI, then a rate class that sets your premium. How build charts work, the typical bands, and what you can do.

How Much Weight Is One BMI Point? (It Depends on Your Height)

One BMI point equals your height in metres squared, in kilograms - so taller people need more. Worked examples, a by-height table, and what it means.

Beyond BMI: Every Body Measurement Number, Explained

BMI Prime, Ponderal Index, waist-to-height, waist-to-hip, body-fat %, lean mass, and BRI - what each measures, its formula, and when it's useful.

Is Your BMI Accurate for You? A 9-Point Checklist

BMI fits many people and misleads others. Run nine quick checks - muscle, age, ethnicity, pregnancy, height - to see how much to trust your number.

How Much Should You Weigh for Your Height? An Honest Answer

The honest answer is a healthy range, not one number. How the range is derived, why the classic ideal-weight formulas disagree, and what they miss.

Is BMI Accurate? What the Research Really Says

BMI is usually right about groups and often wrong about individuals. When to trust it, where it misleads, and what to measure alongside it.

Why Your BMI Says 'Overweight' When You're Not

BMI cannot tell muscle from fat. Why fit, muscular people read 'overweight', who it affects most, and how to find your real picture.

Asian BMI: Why Your Healthy Range May Be Lower

The WHO and Singapore flag 'overweight' at BMI 23, not 25, for Asian populations. The reasons, the cut-offs, Japan's JASSO scale, and how to check.

Metabolism & energy

How many calories your body burns, and why.

BMR vs TDEE: The Difference, and Which Number You Actually Need

BMR is what your body burns at complete rest. TDEE is everything you burn in a day. How they differ, how each is estimated, and which is useful for what.

How Many Calories Does It Take to Maintain Weight?

Maintenance calories are simply your total daily energy use. What drives the number, the rough ranges for adults, and how to find your own.

Does Your Metabolism Really Slow With Age? What the Research Says

The idea that metabolism nosedives in your thirties is mostly a myth. A landmark study found energy use is stable from about 20 to 60. What actually changes, and when.

Body composition

Fat, muscle, and what the scale can't see.

Healthy Body Fat Percentage by Age and Sex

What counts as a healthy body fat percentage, why women's ranges sit higher than men's, how the numbers drift with age, and what body fat shows that BMI cannot.

How to Measure Body Fat at Home: 6 Methods Compared

Smart scales, calipers, the tape method, and more, compared on accuracy and convenience, plus why consistency beats chasing a perfect number.

Does Muscle Weigh More Than Fat? The Truth About Density

A kilogram of muscle and a kilogram of fat weigh the same. Muscle is just denser. Why that one fact explains a stubborn scale and a misleading BMI.

Waist & body shape

Where fat sits matters as much as how much.

Waist-to-Hip Ratio: Chart, Thresholds, and What It Means

Your waist-to-hip ratio describes where your body stores fat. The risk thresholds for women and men, how to measure, and how it compares with BMI.

What Is Visceral Fat, and Why Does It Matter So Much?

Visceral fat is the deep fat around your organs. It behaves differently from the fat under your skin and is far more closely tied to health risk.

How to Measure Your Waist Correctly (and Why It Matters)

Where to place the tape, how snug to pull it, and the small mistakes that throw the number off. A step-by-step guide to a measurement that beats the scale.

The Health Number That Works Alongside BMI (in 10 Seconds)

Keep your waist under half your height. Why waist-to-height flags risks BMI misses, the risk bands, and how to measure it correctly.

Heart & vitals

Resting heart rate, training zones, and blood pressure.

Resting Heart Rate by Age: What's Normal and What's Good

A normal resting heart rate is 60 to 100 bpm, but fitter often means lower. The ranges, how to measure yours, what changes with age, and when to check with a doctor.

Target Heart Rate Zones by Age: The Simple Guide

Your maximum heart rate is roughly 220 minus your age. The five training zones, a moderate and vigorous table by age, and how to use them without a monitor.

Blood Pressure Chart by Age: What the Numbers Mean

What systolic and diastolic mean, the standard categories, why the top number rises with age, how to measure properly, and when a reading needs attention.

Nutrition basics

Protein, water, and reading a label without the hype.

How Much Protein Per Day to Build Muscle?

The evidence points to about 1.6 to 2.2 grams of protein per kilogram for building muscle. What that means in food, how to spread it out, and the myths to skip.

How Much Water Should You Drink Per Day? Beyond '8 Glasses'

The '8 glasses a day' rule is a rough guide, not a law. What the science says about daily water, how food counts, and the two signals that beat any number.

How to Read a Nutrition Label (Without Getting Fooled)

Serving size, calories, the %DV 5-and-20 rule, added sugars, and the ingredients list. A plain-language guide to reading a label and spotting the traps.

Movement & activity

Steps, walking, and how movement adds up.

How Many Steps Per Day by Age? The Evidence Beyond 10,000

The 10,000-steps target is a marketing figure, not a medical one. Real benefits start far lower and level off. What the research shows, by age, and how to use it.

How Many Calories Does Walking a Mile Burn?

Walking a mile burns roughly 80 to 100 calories for many adults, but your body weight is the biggest factor. A by-weight table, what changes it, and perspective.

Sleep & recovery

How much sleep you need and what happens when you get it.

How Much Sleep Do You Need by Age?

The Stages of Sleep Explained (and Why Each Matters)

Light sleep, deep sleep, and REM: what each stage does, how the roughly 90-minute cycle repeats through the night, and what disrupts it.

Life stages

Guidance that changes with the season of life.

Healthy Pregnancy Weight Gain by Pre-Pregnancy BMI

Food & drink

What everyday foods and drinks - like coffee - do to your body.

Is Coffee Good or Bad for You? What the Evidence Says

One of the most studied drinks on earth: what caffeine does in your body, how coffee affects your heart, sleep, and weight, and how much is safe.

How Many Cups of Coffee a Day Are Safe?

About 400 mg of caffeine a day - roughly four to five cups - is the safe ceiling for most adults. How to count yours across coffee, tea, and energy drinks.

Does Coffee Raise Blood Pressure?

Caffeine gives blood pressure a short-lived bump, largest if you rarely drink it. How big the effect is, how long it lasts, and what it means if yours runs high.

Does Coffee Cause Heart Palpitations?

A fluttering or pounding heart after coffee is common and usually harmless. Why caffeine triggers palpitations, what the research shows, and the warning signs.