Home › Guides

Guides

Health & Fitness Guides

Plain-English, evidence-based articles that pair with our free calculators.

Weight Loss

How Many Calories Should You Eat to Lose Weight?

Learn how many calories you should eat per day to lose weight safely, how to set a calorie deficit, and how to estimate your numbers with simple formulas.

Nutrition Basics

BMR vs TDEE: What's the Difference?

BMR and TDEE both describe how many calories you burn, but they are not the same. Here is the difference, how to calculate each, and how to use them.

Muscle & Strength

How Much Protein Do You Need to Build Muscle?

How much protein you need to build muscle, the best daily target in grams per kg, meal timing, and the best protein sources - explained simply.

Health Metrics

Is BMI Accurate? Its Limitations and Better Alternatives

Is BMI accurate? Learn what BMI gets right, where it fails (athletes, age, ethnicity), and which measurements give a fuller picture of your health.

Nutrition Basics

How to Calculate Your Macros (Step by Step)

A simple step-by-step guide to calculating your macros - protein, carbs, and fat - for fat loss, maintenance, or muscle gain, with a worked example.

Health Metrics

What Is a Healthy Body Fat Percentage?

Healthy body fat percentage ranges for men and women by fitness level, how to measure body fat, and how it differs from BMI.

Healthy Habits

How Much Water Should You Drink a Day?

How much water you should drink per day based on body weight and activity, the signs of good hydration, and whether the 8-glasses rule is real.

Weight Loss

How to Lose Belly Fat: What Actually Works

Evidence-based ways to lose belly fat: why spot reduction is a myth, the role of a calorie deficit, and how to measure abdominal fat risk.

Weight Loss

How to Lose Weight Safely (A Beginner's Guide)

A realistic, evidence-based guide to losing weight safely - how to set a calorie deficit, what to eat, how to exercise, and how to keep it off.

Muscle & Strength

How to Build Muscle (A Beginner's Guide)

How to build muscle as a beginner - the training, protein, and calories you need, how fast you can grow, and the mistakes to avoid.

Nutrition Basics

Intermittent Fasting for Weight Loss: Does It Work?

An evidence-based look at intermittent fasting for weight loss - how it works, popular methods like 16:8, the pros and cons, and who should avoid it.

Weight Loss

Why Am I Not Losing Weight? 8 Reasons for a Plateau

Stuck at the same weight? Here are eight common reasons for a weight-loss plateau and exactly how to break through each one.

Nutrition Basics

How to Boost Your Metabolism: What Actually Works

An honest, science-based guide to speeding up your metabolism - what genuinely raises calorie burn and which metabolism boosters are myths.

Health Metrics

What Is the Ideal Weight for Your Height?

How to find a healthy, ideal weight for your height using BMI ranges and classic formulas - plus why a range beats a single number.

Muscle & Strength

How to Gain Weight Healthily

How to gain weight and build mass the healthy way - the calorie surplus, protein, food choices, and training that add weight without junk.

Healthy Habits

How Many Steps a Day to Lose Weight?

How many steps a day to lose weight, how many calories steps actually burn, and how to use a step goal alongside diet for real results.