The formulas behind the calculators, written out in plain English. What each number means, which study it came from, and the situations where it gives the wrong answer.
The idea that coffee dehydrates you has been tested repeatedly and keeps failing. Here is what the research says about caffeine, and how to count every drink you have during the day.
Read the guide →The same number describes two completely different bodies depending on sex. Here is what 20% body fat looks like, what it means for health, and how to find out whether you are at it.
Read the guide →Estimate exercise sweat rate with a worked example and understand why fluid loss cannot be reduced to a universal performance threshold.
Read the guide →Learn when electrolyte replacement may matter, why sodium does not prevent overdrinking, and which exercise symptoms need urgent help.
Read the guide →Understand why muscle-gain timelines vary and why scale weight, fat-free mass and FFMI cannot prove a personal muscle ceiling.
Read the guide →Learn what research shows about simultaneous fat loss and lean-mass gain, and why it does not guarantee a personal recomposition result.
Read the guide →Understand visceral fat, what waist measurements can suggest, and why a home calculator cannot diagnose internal fat or metabolic disease.
Read the guide →Calculate waist-to-height ratio using the recommended measurement site and understand the limits of its adult screening categories.
Read the guide →Review a weight-loss plateau without automatically cutting calories, blaming tracking or assuming metabolism is permanently damaged.
Read the guide →Understand serving sizes, food logs and watch estimates without assuming a fixed error percentage applies to your calorie count.
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