From 2 episodes and 1 video
Why do I weigh more the week before my period?
Answered by Nikkiey Stott and her guests · Updated
The short answer
You weigh more the week before your period because shifting hormones in the luteal phase cause water retention and bloat, not fat gain. Nikkiey Stott says the scale is almost guaranteed to rise that week. A WarriorBabe video puts it at about one to two pounds. It's a temporary fluctuation that balances out.
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Nikkiey on why your hormones push the scale up before your period
Plays from 5:44 · Ep. 245: Why Does My Weight Fluctuate Daily? Scale Mindset Tips

Why one to two extra pounds the week of your period is water, not fat
Plays from 3:00 · Video: Why Chasing Weight Loss Can Cause Fat Gain Later
Nikkiey on why progress photos show bloat, not weight, before your period
Plays from 20:54 · Ep. 204: How to Sync Strength Training With Your Menstrual Cycle
The full answer
On Ep. 245, Nikkiey explains that women fluctuate several pounds across their cycle because of the hormones shifting in the body. In the last phase, the luteal phase, the scale is almost guaranteed to go up. She doesn't even like calling it weight gain, because it's water retention. A WarriorBabe video gives a smaller figure, one to two pounds the week of your period from inflammation and water retention. Your number may land anywhere in that range. Either way it's a fluctuation, not fat. The video adds some perspective: gaining two pounds of fat in a single day would take eating 7,000 calories, and that isn't what's happening.
You'll often see it in photos too. On Ep. 204, Nikkiey says she asks clients to tell her when their period is coming, because bloat shows up in progress photos. In her words, it's not weight, it's bloat. The luteal phase is also the longest phase, and closer to your period it's common to notice lower energy, more emotion and the usual PMS symptoms.
What to do about it:
- If the scale messes with your head, Nikkiey used to tell clients to skip weighing the week before their period and weigh every two weeks at that point instead.
- Some of her clients just flag it: "I'm starting my period this week," so the higher number doesn't come as a surprise.
- Remember that other things stack on top of your cycle. Sodium, carbs, sugar, not having had a bowel movement and sore muscles after a hard workout can all push the number up temporarily.
The bigger point from both episodes is that body weight bounces around while fat loss is far steadier. A higher number that week doesn't mean your plan stopped working. Look at inches, photos taken at the same point in your cycle, strength and how your clothes fit before you decide anything.
From Nikkiey Stott and WarriorBabe's coaching. For education, not medical advice: talk to your doctor about your own health.
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