Body
What your weight, body fat, and measurements such as your waist say about your health, and how to measure them well.
How bioelectrical impedance works, what a study of fifteen devices found, why hydration moves your reading, and how to weigh in so the trend means something.
November 4, 2026 · 3 min read
What appendicular lean mass and its index measure, the European and Asian cut-offs for sarcopenia, why strength comes first, and what keeps muscle as you age.
November 4, 2026 · 3 min read
Where to put the tape, why different guidelines measure the waist in different places, the WHO's cut-offs for waist and waist-to-hip ratio, and how to keep your measurements comparable.
November 4, 2026 · 3 min read
What a DXA scan's T-scores and Z-scores compare you with, the WHO's cut-offs for osteopenia and osteoporosis, which site counts, and how to compare one scan with the next.
November 4, 2026 · 3 min read
The WHO's body mass index categories, the lower cut-offs used for many populations, why BMI can't tell fat from muscle, and how to read your own number over time.
November 4, 2026 · 3 min read
What BMR is, how the Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle equations differ, which one the evidence favours, and how far any estimate can be from you.
November 4, 2026 · 3 min read
Why the fat around your organs matters more than the fat under your skin, how CT, MRI, DXA, and smart scales measure it, and what lowers it.
November 4, 2026 · 3 min read
The ranges most often used for adults by sex and age, where they come from, why no guideline sets an official cut-off, and why the method you measure with changes the number.
November 4, 2026 · 3 min read
Water, glycogen, food in transit, weekends, and the menstrual cycle all move the scale. How big normal swings are, and how to read the trend underneath them.
November 4, 2026 · 3 min read
Keep your waist to less than half your height. Where the 0.5 rule comes from, what the evidence says against BMI and waist alone, and how to follow your ratio.
November 4, 2026 · 3 min read
Devices
Two scales give two weights, and your phone and your watch count different steps. Here's why, which number to trust, and how to keep the comparison fair.
October 27, 2026 · 5 min read