Health Guides

Health and fitness guides you can trust

Our health guides break down the numbers behind your wellbeing in a clear, practical way. From understanding what your BMI really means to working out how many calories you need to lose weight sustainably, each article explains the science simply and honestly — including the limits of every measure. Paired with our free health calculators, these guides give you a sensible starting point for setting realistic goals, while always encouraging you to check with a doctor for anything personal.

Our approach to writing about health numbers

Health figures are unusually easy to misuse. A single number arrives with no context, gets read as a verdict, and then drives a decision it was never designed to support. These guides are written to put the context back. Each one explains what a measurement was actually built to do, what it quietly leaves out, and how confident you should be in it — because a number you understand the limits of is far more useful than one you trust completely.

We stay away from urgency and away from absolutes. There is no perfect eating window here, no single correct body weight, and no claim that one number determines your health. Where the evidence is a population average rather than a personal rule, we say so.

What the guides cover

Reading a BMI result properly

Our BMI guide starts with the practical part — where your result falls on the standard adult scale — and then spends most of its length on the harder question of what that placement does and doesn't tell you. Because BMI compares weight to height and nothing else, it cannot separate muscle from fat or account for where weight sits on your body. It's a screening signal that suggests whether a closer look is worthwhile, not a conclusion about your health.

Setting a calorie target you can actually hold

The calories-to-lose-weight guide covers how to build a deficit that survives contact with real life. The common instinct is to cut as hard as possible, which tends to produce fast early results, growing hunger and then abandonment. A moderate deficit you can maintain for months outperforms an aggressive one you keep for three weeks. The guide also explains why loss slows as you go: a lighter body burns less, so a deficit that worked at the start gradually stops being a deficit at all.

Telling BMR and TDEE apart

These two get mixed up constantly, and building a plan on the wrong one leaves people eating hundreds of calories below what they need. Our guide separates them clearly — your basal rate is what you'd burn at complete rest, while your total daily expenditure adds everything you do on top of that — and explains which one belongs at the centre of a calorie plan, along with how much of the difference comes down to an activity level you're estimating by eye.

When to stop calculating and ask someone

Every calculator and guide on this site is general information. None of it is personalised medical advice, and none of it takes account of your history, medication or anything a clinician would notice. If a result concerns you, if your weight is changing without explanation, if you're pregnant or breastfeeding, if you're managing a diagnosed condition, or if you've had a difficult relationship with food or body image, please talk to a doctor or a registered dietitian rather than adjusting a number on a screen. That conversation is the one thing a calculator can't substitute for.