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Body weight swings five pounds
Weight fluctuations are identified as a major reason people get discouraged on a weight-loss attempt. Someone in a calorie deficit steps on the scale on a day they are holding extra fluid, concludes the plan isn't working, and loses buy-in, even though the weekly average may be dropping.
One approach is to weigh in first thing in the morning after using the bathroom, every day, then compare each week's average with the next week's.
Fluid also explains why low-carb diets often work well early on: people lose a lot of water weight quickly, and that visible drop builds buy-in.
What makes body weight swing from day to day?
Glycogen, the carbohydrate stored in muscle and liver, holds about 3 grams of water for every gram stored, so carbohydrate intake moves water weight. Sodium intake changes how much water the body retains. The food and waste moving through the digestive tract also count on the scale. Hormonal cycles shift fluid balance as well.
Why do low-carb diets drop water weight so fast?
Cutting carbohydrate drains liver and muscle glycogen within days, and the water bound to it is released. Lower insulin levels also signal the kidneys to excrete more sodium, which pulls additional water out with it. The result is a quick drop on the scale that has little to do with body fat.
Why does a weekly average smooth out the noise?
Daily fluid shifts are random in direction, so highs and lows cancel when readings are averaged. Real fat change is slow and steady, which makes it the signal that remains. Statistically, averaging n independent measurements shrinks random noise by about the square root of n. Seven daily weigh-ins therefore carry far less noise than any single one.
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