Dear Dr. Mo: Why does weight fluctuate during the course of a day? Normally my weight is lower early in the morning than it is at night.
Dear reader: The most common reason for such daily weight fluctuations is so called “water weight”.
What does “water weight” mean?
You retain some water during the day and this is reflected in changes in your scaled weight within 24-hour periods. These changes are not drastic and are usually anywhere between a few hundred grams to about 2 kilograms (a few pounds).
Now to be clear, these gains are certainly not in fat – to gain so much fat in a day (say about 2 kilos) one would have to consume about 14 000 to 15 000 calories, which is borderline impossible and probably not even survivable. Continue reading