Why 1 number can mislead you
You step on the scale on Monday and it says 72.4 kg. On Wednesday it says 73.6 kg. You ate normally and trained 2 times. Did you gain over a kilo of fat in 2 days? No. You cannot. Gaining one kilo of body fat takes many extra calories, far more than a couple of ordinary days.
What the scale measures is your total mass: fat, muscle, bone, organs, water, and whatever food and drink is still moving through you. Of all of these, water and gut contents change the fastest. That is why the scale feels like it lies. It is not broken. It is just answering a different question from the one you asked.
What moves the number day to day
- Water and salt: a salty meal such as chips with a lot of salt, or fried fish and chapati, makes your body hold extra water for a day or 2.
- Carbohydrates: each gram of stored carbohydrate holds water with it. A rice and matooke heavy day can raise the scale without any fat gain.
- Food in your gut: a large dinner can weigh a kilo or more until it is digested.
- Hormones: many women see a rise of a kilo or 2 of water during parts of the menstrual cycle.
- Hard training: sore, inflamed muscles hold fluid while they repair, so the scale can climb after a tough new workout.
- Heat and hydration: in Kampala's warm weather, sweating and drinking patterns shift your weight through the day.
- Time of day: you are lighter in the morning after the toilet and heavier in the evening.
How to use the scale properly
The scale is a useful tool if you handle it well. Follow these rules:
- Weigh at the same time, ideally key thing in the morning after using the toilet and before eating or drinking.
- Use the same scale on the same hard, flat floor.
- Weigh 3 to 7 times a week and record every reading.
- Look at the weekly average, not single days. Add up the week's readings and divide by the number of weigh-ins.
- Compare this week's average with last week's and with 4 weeks ago.
A downward trend in the average over 3 to 4 weeks is real fat loss. A heavy morning is noise.
If weighing makes you anxious or sends you into a bad mood, it is fine to weigh less often, or not at all. Other measures work well.
Better ways to track progress
Waist and body measurements
A soft tape measure costs very little. Measure around the navel for your waist, and optionally the hips, chest, upper arm and thigh. Do it every 2 weeks, in the morning, standing relaxed, not pulling the tape tight. Waist size is a useful sign of fat around the middle, which is also linked to health risk. If your waist is shrinking while your weight barely changes, you are losing fat and likely holding or gaining muscle.
Progress photos
Take photos every 4 weeks. Same place, same light, same clothes, front, side and back. Photos catch changes in shape that you miss when you see yourself every day. Compare month to month, not week to week.
Strength numbers
Keep a simple training log in a notebook or your phone. If you are squatting 10 kg more than you did 6 weeks ago, or doing push-ups on your toes instead of your knees, that is real change. Rising strength while fat drops is a good sign that you are keeping muscle.
Clothes
Pick one pair of fitted trousers or a dress and try it on each month. Looser at the waist and snug at the shoulders is a very honest report.
Fitness and daily life
- Can you climb stairs without stopping?
- Can you walk for 45 minutes at a steady pace?
- Is your resting heart rate a little lower than it was?
- Are you sleeping better and feeling more energy in the afternoon?
These are results too. They are often the ones that matter most to your health.
Body fat estimates
Smart scales and some gym machines estimate body fat using a small electrical current. They are useful only for trends and are affected by hydration, so treat the number as a rough guide and never as a precise fact. Never compare readings across different devices.
Putting a tracking system together
You do not need all of these. A good minimum set is:
- Morning weight, 3 to 5 times a week, averaged weekly.
- Waist measurement every 2 weeks.
- Photos every 4 weeks.
- A workout log.
Review them together once a month, in 1 sitting, on the same day. Ask 3 questions: is my weight average trending the way I want, is my waist smaller or the same, and are my lifts and stamina better? If 2 out of 3 are moving the right way, stay the course.
What to do when the numbers disagree
- Weight up, waist down, lifts up: probably gaining muscle and losing fat. Keep going.
- Weight flat, waist flat, lifts flat for 4 weeks: your plan needs a small change. Trim a little food, add some walking, or review your protein and sleep.
- Weight down fast, lifts dropping, tired all the time: you are eating too little. Eat more.
- Weight up, waist up: you are probably in a calorie surplus. Adjust if fat gain is not your goal.
If you have a history of eating disorders, or tracking numbers triggers distress, speak to a doctor or a counsellor and choose measures that feel safe for you, such as strength and energy rather than weight and size.
Key takeaways
- Daily weight changes of 1 to 2 kilos are mostly water, salt, carbohydrate and food in the gut, not fat.
- Weigh under the same conditions and judge the weekly average over 3 to 4 weeks.
- Waist measurement, progress photos, strength numbers and how your clothes fit often tell the truth better than the scale.
- Review your measures once a month together, and change your plan only when they stall for several weeks.
- If the scale harms your mood, it is fine to track other things instead.
