A single high-sodium meal can add 1–2 kg of water within 24 hours. Low-carb days can strip an equal amount off. Neither is fat.
Each gram of stored carbohydrate holds ~3g of water. Sodium pulls water into circulation. Both change fast.
Use a 7-day rolling average. Weigh at the same time in the same conditions. Trends over 2–3 weeks are the signal.
Focus on the metric that matters: waist.
WHtR Calculator →
BMI can label muscular athletes as overweight or obese. Here's when BMI misses the mark and what to use instead.
The clearest waist guideline for women, based on the NHS and Ashwell Waist-to-Height ratio — no charts, just one rule.
How age changes your healthy weight range, and the simple WHO/CDC formula that answers "how much should I weigh?".