When does a pound come off?

Lindalo5032

I started trying to change some bad eating habits the last week of March. So far I've lost a little over 10 pounds (about a pound a week on average).

I eat about the same thing during the week, i.e., lots of veggies, fruit, fiber, more protein than before, but watch the calories and keep it a little below 1200. I started doing the treadmill 6 days a week with a little weight lifting 3x a week. I'm 63, very small frame, and started at 145 lbs. I would like to end up at 125 or maybe even 120. When I was younger, I weighed 108 for years.

On weekends when I am with family I do eat a little less healthy (at least on Sundays), although I do try to watch portion size and total calories. And Sunday is the only day I don't exercise.

So the weird thing is--Monday seems to be the day the scales go down another pound. The rest of the week it's up and down by several tenths of a pound, even though I eat more on Sundays and don't exercise.

I guess this is a physics question. Why does my weight go down on Mondays? Does it just take awhile for the pound to come off after eating healthy & exercising all week? Or does the exercise make the muscles retain water, and then since I don't exercise on Sunday it drops off on Monday?