Accuracy
How close these estimates really are, where they go wrong, and how much of it matters.
Average BMR by Age: Charts for Women and Men
What a normal BMR looks like at 20, 40 and 60, why it falls with age, and why most of that decline is not really about age at all.
US Navy Body Fat Formula: How It Works and How Accurate It Is
A tape measure, three measurements and a logarithm. Where the Navy method came from, how to get a consistent reading, and what it can and cannot tell you.
Why Does My Weight Fluctuate So Much Day to Day?
You were up a kilogram this morning and did nothing wrong. What actually moves the scale overnight, and the one habit that makes the noise irrelevant.
The Science of Food Journaling: What the Research Actually Shows
The research is real and the headline oversells it. What self-monitoring studies actually found, and why the effect is smaller than the slogan.
Does Apple Health Track Calories Eaten?
Health stores a Dietary Energy figure but knows nothing about your meals. What the number is, where it comes from, and its limits.
How Accurate Is Apple Watch Calorie Tracking?
Heart rate: excellent. Calorie burn: 20–40% out. Why the error is structural, and the one rule that stops it costing you.
How to Describe a Meal So the AI Calorie Estimate Is Accurate
The estimate is only as good as the sentence. Five details that actually move the number, and the ones that waste your time.
What to Look For in an AI Calorie Tracker
Eight things that decide whether you are still using it in three months, and the marketing claims worth ignoring.
Are AI Calorie Counters Accurate? An Honest Answer
They are estimates, not measurements. But accuracy is the wrong thing to be worrying about, and here is why.
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