The scale is fickle: we lose weight when we pee or when we do a sweaty workout.

We gain weight when we eat or drink or put on a sweater.

But how much does that kind of fluctuation really impact the numbers we see?

I weighed myself fifteen times in one day to find out.

140.3 pounds at 9:16am: I step on the scale for the first time.

Ive just woken up.

Im wearing light pajamas.

138.9 pounds at 9:19am:After going to the bathroom.

Apparently my bladder can hold at least 1.4 pounds of urine.

Well, thats a new thing I learned.

141.6 pounds at 9:23am: Fully dressed, in jeans and shoes.

143.2 pounds at 9:24am: Oops, forgot my hoodie.

Thats 4.3 pounds of clothing in total.

145.4 pounds at 10:35am: After breakfast, which apparently weighed 2.2 pounds including beverages.

144.4 pounds at 11:45am: After pooping.

Thats a one pound poop.

147.0 pounds at 2:23pm: After late lunch/early dinner.

145.8 pounds at 2:28pm: Peed again, 1.2 pounds.

145.1 pounds at 5:58pm: Didnt do anything special in the last few hours.

Lost over half a pound!

144.3 pounds at 6:57pm: Ditto.

Another half pound gone.

Losing weight is easy!

142.4 pounds at 7:04pm: In workout clothes and hoodie.

Im back to my pre-breakfast weight.

Now its time for a Nike Training Club workout (the one they call Lifted by Lunges).

142.3 pounds at 7:45pm: After a 30-minute workout.

140.1 pounds at 8:15pm: Naked, after shower, damp hair.

This is the least Ill weigh all evening.

142.9 pounds at 11:07pm: One last weigh-in wearing regular clothes.

142.4 pounds at 11:09pm: In my pajamas.

We typically lose a few pounds while we sleep.

I was down to 139.3 the next morning, within a pound of my initial weigh-in.

I think of myself as a 140-pound person, but my highest weight was 147.

My lowest was 138.9.

I knew Id see fluctuations, but I was surprised at how big they were.