What Do Perimenopause, Black Pepper and Swollen Knees Have in Common?

This article is written in Kristina's voice — the founder of Carnivore Lifestyles, competitive ocean paddler, and someone who's spent almost 30 years learning to read her own body.

Three things that have nothing to do with each other. That's what I would have said too, until last year.

Here's the short version. I'm almost 50. Mid last year even my "good knee" got cranky & started swelling up for no reason I could find. Not the one I'd had two surgeries on after a couple of decades of wild skiing and snowboarding and inevitably a few accidents — when I was still "snow crazy" & even lived in Bariloche just to be on the snow during the whole season. The good knee. The clean one. The one that had never given me trouble.

I was eating the same foods I'd eaten for years. Scrambled eggs in the morning, maybe a bit of meat, avocado, coffee. Nothing new. Nothing I hadn't already trained myself, over a lifetime of managing an autoimmune condition, to know was safe for me.

When I finally sat down and tracked everything — and I mean everything, including what I was adding to my food — one thing came up that I'd never paid attention to. The black pepper I dusted onto my scrambled eggs most mornings. Especially when it compounded over a couple of days. That was where the swelling was coming from. I dropped it. Within about two weeks, the swelling stopped.

It took me weeks to figure that out. And I've spent my whole adult life reading my own body. This is the story of how I got there — and what perimenopause taught me about a body I thought I already understood.

I Thought I Had My Body Figured Out

I've been managing an autoimmune condition since my early twenties. That's twenty-five years+ of reading the signal — what inflammation feels like, what calms it down, what sets it off. When you live with something like that for that long, you stop relying on doctors to tell you what your body is doing. You become the instrument.

On top of that, I've spent most of my adult life as a competitive athlete and more recently an ocean paddler. International level — top 25% of masters in the world as recently as 2023. You don't race at that level without learning to read your body. Hydration, recovery, sleep, food. What makes you faster. What makes you heavier. What inflames a joint and what leaves you fresh on the start line. Body awareness isn't a wellness phrase for me. It's the job.

I knew my triggers and I knew my recovery patterns. By early 2025 I was eating in a way I trusted completely and not thinking too hard about food. I had this figured out.

And then mid 2025 happened.

What Perimenopause Actually Felt Like (for Me)

Nobody handed me a diagnosis. There's no single test for perimenopause — which is part of the problem for women trying to make sense of it. What I had was a pattern. Multiple things shifting at once, in a window that lined up with my age. I was 49 at the time. Perimenopause hit me later than the statistical average — I'd half-expected it to arrive earlier. It kicked in last year only.

Here's what changed for me, in the order I noticed it:

My cycle, which had been regular my entire adult life, started shifting. My skin changed in ways I hadn't seen before. My fluid retention went up. And the autoimmune condition I'd spent twenty-five years learning to read started reacting differently — the baseline inflammation I knew so well was running a little hotter, behind everything else. Then the knee swelling started.

Notice what's not on that list: brain fog. A lot of women I hear from talk about brain fog as one of the loudest perimenopause symptoms. Mine didn't change — and I think that's because my low-carb, mostly-animal baseline was already doing the heavy lifting on that one. That's not the universal story. It's just mine. If brain fog is part of what you're navigating, I've written about brain fog after eating in a separate piece — the food connection there is the same thread as the one I'm pulling on here.

The other thing I want to flag, because it's important: I don't claim I've found every trigger. Black pepper was the biggest one. It was the one I could see clearly enough in my data to act on. But what I've learned through my life is that triggers change — and especially right now with perimenopause, they seem to be changing heavily. There could be foods that are nudging me in a negative direction that I haven't yet surfaced, because the signal is still under the threshold where I'd notice. Tracking, for me, is an ongoing practice. Not a one-time discovery.

If you want the science of what's actually happening underneath all of this — estrogen, histamine, the gut barrier, why food sensitivities shift in perimenopause at all — we're in the process of writing that up as a separate research piece (watch this space over the next couple of weeks). The piece you're reading right now is the lived-experience half. That one is the mechanism half.

There's also a thread to pull on if it's joint pain that flares after eating that brought you here — for me, the knee swelling was the clearest signal. For you it might be something else.

Why I Didn't Go to a Doctor (and the Honest Reason Most Women Would)

I want to be careful with this one, because I know how many women in the same situation as me have gone to a GP first and been told it's "just perimenopause." That's a real story. It's a common story. It's one I hear from women in our community all the time, and if that's been your experience — being walked out of an appointment with no answer and the suggestion that you just learn to live with it — I'm sorry. That's not your fault. That's not failure.

My own path was different, and I want to be honest about why.

I've been managing my autoimmune condition most of my life — as well as being an elite athlete — and I actually know my body pretty well. I know what it feels like when I trigger inflammation in it, whether from food or other things. So when I started feeling the fluid retention and the swelling of the knees and just the way the body felt, I knew that it was inflammation. And in my case, most of the time, inflammation is caused by particular food triggers. So through lived experience, I already knew what to try before heading to a GP. That's why I went straight into trying to figure out what was inflaming my body now.

This isn't advice. It's the map I happened to have because of where I was starting from.

For most women noticing new patterns in perimenopause, a conversation with your GP or specialist is the responsible first move — to rule out other conditions that can mimic this picture and warrant a clinical eye. My own path didn't run through that step, because decades of managing an autoimmune condition had already taught me to read inflammation in my own body. That was my specific starting point, not a recommendation. What I want to be honest about is that tracking your own triggers tends to be part of the picture either way. Whether you came in through a GP or skipped straight to your own kitchen, the work of figuring out which foods affect you lands somewhere along the way. The clinical workup tells you what isn't going on. The tracking tells you what is — for your individual body, right now.

That was the moment, for me, when I went looking for a tool.

No Tool Existed, So I Built One

I went looking for a tracking app that could handle what I needed. Food, yes — but also condiments, additions, things you add to the food. Plus symptoms. Plus the ability to surface delayed patterns where a trigger compounds over a couple of days, not within a single meal. I couldn't find one. There were plenty of food diaries, plenty of macro counters, plenty of elimination protocols. None of them tracked what I needed to track in the way I needed to track it.

So I started building it.

In my own words from the time: "Once I started, when I looked into the issue and I found that there was no tool, I started building it. And it didn't take me too long to have a development version — a very, very raw application working. But it was enough for me to start tracking and see what worked for myself."

That very raw dev version was the thing I used on my own data. With the tracking laid out in front of me, I could finally see it — the black pepper that I usually added to my scrambled eggs, especially compounded over a couple of days, lining up with the knee swelling. The tool didn't tell me what to do. It gave me the view. The seeing was still on me. But I couldn't have seen it without a systematic way to track food and symptoms together, because the pattern took days to form and my memory wasn't going to hold it.

The dogs followed. DJ and Shadow had been on a spreadsheet up until that point — I'd been tracking what they ate and how their skin and gut responded the same way I tracked myself. When the dev version existed, they migrated onto it with me. That's the small detail that became the pet half of the company. (If you're navigating an itchy dog at the same time you're navigating yourself, the ItchyPet quiz is the fastest read-in.)

The tool I started building for myself is now called Carnivore Lifestyles, and you can try it free for 14 days at app.carnivorelifestyles.com/signup. I built it because I needed it. I'm telling you about it because, if any of this story is sounding familiar, you might too.

What I Want You to Take from This

Every one of us is built as an individual, and every one of us has different triggers and different experiences.

I want a woman (and the men who stumbled upon this article) reading this to feel empowered to understand their own body, and to understand how their individual body reacts to things. Not what worked for me. Not what worked for the woman whose blog you read last Tuesday. Your body. Your signal. Your current version of yourself — which, if you're somewhere near the age I am now, is probably not the same body you had at 30, and won't be the same one you have at 60.

The black pepper isn't the point of the story. The willingness to look at my own data, in a body that had changed without warning, is the point.

If you want to start tracking your own triggers — across food, condiments, symptoms, sleep, all of it — the app I built for myself is yours to try, free for 14 days. Start your 14-day trial →

And if you want the science behind what I went through — the estrogen-to-histamine connection, the gut-barrier shifts, why food sensitivities show up in perimenopause when they hadn't before — watch this space. We're working on it!

Medical disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before making significant dietary changes, particularly if you are managing a diagnosed medical condition, taking prescribed medication, or have a history of disordered eating. The carnivore or animal-based elimination approach involves significant dietary restriction — appropriate professional supervision is especially important for anyone with a history of nutritional deficiency, kidney disease, or cardiovascular conditions. Perimenopause symptoms can have multiple causes — including thyroid dysfunction, autoimmune flare, iron deficiency, and other conditions that mimic this picture — and warrant medical evaluation to rule out other causes; do not discontinue prescribed medications without direct guidance from your treating doctor. If you suspect a true food allergy (especially one causing severe or anaphylactic reactions), seek evaluation from a board-certified allergist. For pet dietary changes, always work alongside a qualified veterinarian.