Perimenopause Weight Gain: When the Math Stops Working
Perimenopause weight gain is something I want to talk about, and I want to start with a pair of jeans.
I have always been someone who buys classic pieces and keeps them forever. Same style, same fit, same clothes I have worn for years. I found what works for my body and I stuck with it. So I did not even own a scale, because I have never needed one. My body has been pretty consistent my whole life, and I knew what that felt like. Until I did not.
In about ten weeks, between February and May of this year, I gained fifteen pounds. Not over the course of a year. Ten weeks. While logging 940 miles of running, 850 miles of walking, and 134 hours of strength training. The math was not mathin’, and I could not figure out why.
This episode is about what was actually happening in my body and why everything I thought I knew about weight management stopped working almost overnight. If you are an active woman in midlife and your body is doing something that does not match the effort you are putting in, keep reading. The answer has a name, and your doctor may not be bringing it up.
The Year My Body Held (And Then Didn’t)
Here is what makes this story interesting to me: it was not the whole year. I want to be clear about that, because the timeline matters.
For most of last year, I maintained my weight through an entire marathon training cycle. My body held steady while I was putting in serious miles. Then I ran the Austin Half Marathon on Valentine’s weekend, and something shifted. If you listened to last week’s episode, you already know what that race did to me as a runner. It was the day everything my Garmin said looked perfect, and my body refused to cooperate anyway. What I did not cover in that episode is what Valentine’s weekend also started.
The estrogen crash that derailed that race also knocked something loose that my body could not recover from on its own. After that weekend, the perimenopause weight gain started coming on fast. Not a slow creep, not a pound here and there. Fast. Fifteen pounds between February and May. You can hear the full running identity story in Season 3 Episode 8, but this episode picks up where that one left off.
What I Thought Was Happening
I blamed perimenopause. Broadly, generally, in the way you blame something when you do not have a real answer. Because what else do you blame when you are moving every single day and still watching your clothes stop fitting?
I was not eating terribly. I was still walking and running and lifting. The story I kept telling myself was: I must be missing something. Because I refused to believe I was doing everything right and this was just my life now.
There was one piece I did miss, though. After the half marathon, my appetite dropped. That is normal. You stop logging big miles, your hunger follows. But my body was still deep in repair mode from months of training, and it needed more fuel than I was giving it. I did not know that combination was a problem. It turned out to be a significant one.
The Answer: RED-S and What It Actually Means
The answer came through bloodwork and asking the right questions. It has a name most people have never heard: Relative Energy Deficiency in Sport, or RED-S.
In plain terms, RED-S means your body does not have enough fuel to support everything you are asking it to do. Not because you are eating badly, but because the energy coming in does not match the energy going out, and your body responds to that gap by going into survival mode. When that happens, your metabolism slows, your hormones get more disrupted, and your body holds onto fat instead of releasing it.
Now layer in everything else that was happening in my body at the same time. Lifelong vegetarian, so certain nutrients were already harder to come by. Perimenopausal, so hormones were already in flux before the crash. Ferritin critically low. Omega-3s below range. Systemic inflammation showing up in my bloodwork. A body running on depleted reserves for longer than I realized.
My body was not storing fat because I was lazy or undisciplined. It was storing fat because it was scared. It was holding onto everything it could get because it did not trust that more was coming. That is not a willpower problem. That is a physiology problem, and it has nothing to do with working harder or eating less.
Why Perimenopause Weight Gain Goes Straight to Your Midsection
This is the part that broke my brain a little.
Hormonal fat redistribution is real and it is specific. When estrogen declines, your body shifts where it stores fat, moving it away from your hips and thighs and toward your midsection. Which means you can gain weight and it shows up in exactly one place.
My legs look the same. My arms look the same. Everything I own that fits those parts still fits exactly the same. The waistband is the problem every time. So when I tried sizing up, the waist worked and nothing else did. I essentially had a closet full of clothes and nothing to wear. I know every woman says that, but I mean it literally this time.
It also changes day to day. Some mornings I get dressed and feel fine. By evening I am bloated and uncomfortable and nothing fits right. On workdays I stand in my closet and reach for workout clothes because that is what fits. That is where I am right now, not because I have given up on myself, but because my body is doing something that normal rules cannot fix.
Where I Am Right Now (The Honest Answer)
I am not going to wrap this up with a bow, because I do not have one yet.
By the time this episode drops, I will have been on HRT for several weeks and my first iron infusion will have happened about a week prior. The protocol is in place and the work is happening. Nothing has dramatically shifted yet. I am not gaining more weight, and I am not losing it either, and I still have days where I feel like a hot mess. I still have mornings where I look at my closet and feel defeated before the day has even started.
The answers did not make the weight disappear. What they changed is the story I am telling myself. A few weeks ago I was watching my body do something I could not explain, and I kept thinking I was failing. Now I know exactly what happened and why. I know this is not about discipline or effort. There is a real physiological explanation and a real path forward.
That is not nothing. That is actually everything.
What to Ask Your Doctor If This Sounds Familiar
If you are an active woman in midlife and your body is doing something that does not match the math, I want you to hear this: there is probably a reason, and it probably has a name, and your doctor may not be bringing it up.
Ask specifically about RED-S or about hormonal fat redistribution. Ask for a full blood panel that includes ferritin, omega-3 levels, hs-CRP for inflammation, and a complete hormone panel, not just the basics. The internet is full of eat less, move more advice that will make this worse, not better. The real answers come from the full picture.
If you are in this with me right now, the jeans that do not fit, the midsection that appeared out of nowhere, the frustration of doing everything right and watching it not work, you are not crazy. You are not failing. I am right here with you, still figuring it out.
Listen to This Episode: Perimenopause Weight Gain
If you have ever been dismissed, told you were fine, or felt like you were fighting alone…you are not.
Listen to Perimenopause Weight Gain here:
Apple Podcasts | Spotify | jamapantel.com
Keep Listening
Start with last week’s episode if you have not yet. This one lands much harder with the full picture: When Running Stopped Feeling Like Me
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