How to monitor your weight - and which scale to use
You do not need an expensive scale to lose weight. A cheap digital scale used the same way each morning is enough. Smart scales add comfort but their body-fat number is rough. What matters is the method: same time, same conditions, and watching the weekly average - which Burnie records for you.
Here is the honest truth on weighing. You do not need a fancy scale to lose weight. A basic digital scale, used the same way each morning, is more than enough. Smart scales that estimate body fat look impressive, but their fat number is rough. What truly matters is the method - same time, same conditions, same scale - and watching the weekly average, not one morning's number. Burnie records your weights and shows the trend.
A smart scale's body-fat percentage is accurate.
mostly falseMostly false. Smart scales guess body fat by sending a tiny current through your legs (bio-impedance). When researchers tested 15 such devices against the gold standard, only about 5 were truly accurate. The individual error spanned roughly 10-20 percentage points. So trust the scale for your weight, but treat the body-fat % as a loose guide, not a fact. A flat 1-2% daily change in 'body fat' is just water, not real fat loss.
The 1-2 kg morning jump - it's water, not fat
After a salty, carb-heavy meal, the scale can jump 1-2 kg by the next morning. You did not gain 1-2 kg of fat overnight - that would need roughly 7,700-15,400 kcal. Extra carbs get stored as glycogen, and each gram of glycogen holds 3-4 grams of water with it. Extra salt holds water too. Most of the jump is water, and it drops back over 2-3 days of normal eating. This is exactly why one morning's weight is not your real progress.
Assumptions: A true 1-2 kg fat gain overnight would need ~7,700-15,400 kcal on top of normal food - physically impossible. The morning jump is water: glycogen stores 3-4 g water per g glycogen, and excess sodium holds water osmotically. It clears in 2-3 days. The 7,700 figure is the energy in ~1 kg body fat.
What to actually buy and use
A basic digital bathroom scale is enough - it measures weight accurately and that is the number that matters. If you want a smart scale for convenience (it sends the weight to your phone automatically), that is fine, but ignore its body-fat % or treat it as a loose guide. Put the scale on a hard, flat floor (not tiles that wobble), in the same spot. Weigh in the morning, after the toilet, before food or water, in light clothes. Log the number in Burnie and look at the weekly average - that is your real trend.
Assumptions: This is a method choice, not a calorie change, so kcal is 0. The value is consistency: same scale, same spot, same morning conditions, averaged over a week, which strips out the 1-2 kg water noise and shows true fat change of about 0.2-0.5 kg/week for a steady deficit.
Weigh the same way every time
- Same time: first thing in the morning, after the toilet, before food or water. Your weight is most stable then.
- Same scale, same spot, flat hard floor. Different scales and soft floors can change the reading by a kilo.
- Weigh about twice a week, not daily, and look at the weekly average. Daily numbers are mostly water noise.
- Ignore the body-fat % on smart scales. It can swing 1-2% a day from water - that is not real fat change.
- If you must weigh daily, never react to one number. Log it in Burnie and let the trend line speak over weeks.
The bottom line
You do not need an expensive scale to lose weight. A basic digital scale, used the same way each morning - same time, same spot, flat floor - is enough. Smart scales add convenience, but their body-fat number is rough, so trust the weight and treat the fat % as a guide. The 1-2 kg jump after a salty feast is water, not fat; it drops in days. So weigh about twice a week, log it in Burnie, and watch the weekly average trend. That is your real progress. Start logging your weight today.