Rapid Weight Changes in the Same Week

Bigger Stronger Leaner Over 35 Lifter
1

I’ve been experiencing rapid weight loss and rapid weight gains in the same week.

I’ve been working out for almost year every weekday.

I’ve done my homework and know that I’m a mesomorph and I have my macros dialed in. I use MyFitnessPal to record my food and I wear a Fitbit charge2 everyday and record each workout with it. I have a water coach app that helps me drink 85+ ounces every day.

I change my workout every 4 to 6 weeks and I’m trying to reduce my body fat. I’m very serious about losing the fat and I don’t have cheat meals or cheat foods but have weighted the same for over 2 months​.

I first experienced this issue 2 weeks ago when I injured my levator scapula (had to see the chiropractor to fix it), so I was told to take a week off. I followed my meal plan and kept​ my macros and calories in check and didn’t do any lifting for 1 week. I did my weekly weigh-in and found in 4 days I loss 3 lbs. I was excited.

However, after only 1 day of working out (yes, I weighted myself everyday during this time because of the rapid weight loss) I found myself weighing the same prior to my injury.

Is it possible to lose and then regain 4+ pounds after only 1 day of working out?

2

Absolutely.

It is not possible to lose 4 pounds of fat and regain it in a day. But it is possible for your weight to fluctuate that much through changing levels of water and glycogen retention.

This is normal.

2 Likes
3

Yup. The rule of thumb I’ve heard is that fluctuations of up to 2% of bodyweight are considered to be within normal limits (ie, attributable to changes in water, glycogen, waste, etc).

4

Thank you for the replies.

I find this change frustrating and fascinating. I was worried I might be missing something or that there was a physical issue rearing it’s head.

5

This is why I weigh myself every day–so I can see and get a sense for these fluctuations.

6

I like to weigh myself the night before I go on a 36 hour fast…fun to see you ‘lose’ 5 lbs in 1 day…then again…you gain it all back…maybe that’s why I switched to weighing myself once a month…as long as my pants fit I don’t worry how much I weigh day-to-day.