Ep. 83 Why Your Thyroid Might Be Blocking Your Fat Loss

Why Your Thyroid Might Be Blocking Your Fat Loss

You’re eating well.
You’re working out.
You’ve cut calories.
You’ve added cardio.

And nothing is changing.

If weight loss feels impossible in perimenopause — especially around your midsection — your thyroid may be part of the picture.

In this episode, we unpack how thyroid function directly impacts metabolism, why perimenopause creates the perfect storm for thyroid disruption, and why dieting harder often makes things worse.

Because this isn’t a discipline issue.

It’s a physiology issue.

In This Episode, We Cover:

• What the thyroid actually does in the body
• How T3 (active thyroid hormone) drives metabolic rate
• Why perimenopause makes thyroid function more vulnerable
• The role of progesterone, estrogen, cortisol, inflammation, and sleep
• Why under-eating lowers T3
• How excessive cardio increases reverse T3
• The connection between thyroid function and muscle loss
• Why TSH alone doesn’t tell the full story

If weight resistance feels disproportionate to your effort, it may be time to look deeper than calories alone.

Perimenopause changes the hormonal environment.

Your strategy has to change with it.

If you’re ready for a deeper metabolic and thyroid assessment, learn more here:

🔗 www.tracyerinwellness.com

Transcript

Speaker 2 0:09

Welcome to the Balance Hormone Solution podcast. If you're a woman 35 plus, feeling exhausted, struggling to lose weight, and wondering where your libido went, this is for you. I am Tracy Aaron, a functional medicine practitioner who helps women balance their hormones naturally without prescriptions, guesswork, or trendy nonsense, 'cause here's the truth: your symptoms aren't random. They're signals, and if you know how to listen, you can fix the root cause and start feeling like yourself again. If you're ready for real solutions, let's get to it.

Speaker 0:50

Let me paint a picture. You're eating well, you're training consistently, walking every day. You're doing everything you've been told to do, and still the scale won't budge, or worse, it keeps creeping up. You're bloated, you're holding water, your clothes feel tighter, your face looks puffier. You're starting to question everything. Am I eating too much? Do I need to cut more? Maybe I need to train harder. So you restrict, you push, you try another protocol, look on Instagram for another influencer, and nothing works. Here's what I want you to hear today. If your thyroid isn't functioning well and you're in perimenopause, weight loss becomes physiologically harder, not because you're doing something wrong, because your body is operating under conditions that resist the fat loss. So let me explain Your thyroid essentially sets the pace of your metabolism. Every single cell in your body has thyroid receptors, and that means that thyroid hormone influences a lot of things. Things like how fast you burn calories at rest, or how efficiently you u- you use glucose, or how well you break down fat, or how quickly your gut moves, how your body regulates temperature, how your brain processes information. Brain fog, anyone? When thyroid hormone, specifically T3, the active form, is low or unavailable at the cellular level, everything slows down. Not dramatically at first, but enough. Enough that your usual eating feels like overeating. Enough that your usual training just doesn't produce results anymore. Enough that your body holds onto everything more tightly. And here's the key. In perimenopause, thyroid function can shift even if you've never had a thyroid problem before. So this is the part that most women aren't told. Perimenopause changes the entire environment your thyroid operates in, and let me explain how it does that. First, progesterone drops. Progesterone is the hormone that is supporting thyroid hormone receptor sensitivity. So this means that as it declines, your cells may not respond as well. They're not as sensitive to the existing amount of thyroid hormone available, even if it looks adequate on paper, and oftentimes it does, which is why you can have normal, quote-unquote, "thyroid labs" and still have symptoms of a thyroid disorder. The next thing is that during this time of life, estrogen is fluctuating wildly. Now, estrogen affects something called thyroid-binding globulin. When estrogen surges, more thyroid hormone gets bound up, leaving less free hormone available to actually enter the cells. So this is a problem, right? Uh, next thing is that cortisol rises. Chronic stress, whether it's emotional, physical, metabolic, pathological, whatever it is, increases something called reverse T3 production. Okay? Reverse T3 is another marker that I look at on a blood test. It blocks the receptor site that T3 should occupy. So if you have high reverse T3 on a test, you're going to most likely have low T3 because it is in its place, taking up space like a useless space holder. So your body ends up making thyroid hormone that it cannot use properly. The next thing is, is that inflammation increases, right? Perimenopause tends to do increased systemic inflammation just by the nature of moving through this season of life. You can do everything the same and still be more inflammatory. So inflammation over the body is going to impair the enzyme that converts T4 to T3. So if your thyroid gland is produ- even if it's producing enough, it's not being activated. We need enzymes in our gut to turn T4, a storage form, into T3, the active form. And if it's not being activated, it's as if we have no thyroid hormone. The next thing is, is that sleep, right? Sleep disrupts everything. Poor sleep alone can suppress TSH signaling and reduce overnight thyroid hormone production. So if you're waking up at 2:00 AM or 3:00 AM regularly, which is incredibly common in perimenopause, this matters. So to summarize, you now have a woman who is progesterone depleted, estrogen volatile, cortisol elevated, inflamed, sleep deprived, and we wonder why her metabolism has stalled. This is why it's not a willpower problem. It is truly a cellular energy problem. And this is why dieting harder makes it worse. This is where I see women unknowingly dig themselves into a deeper hole. When the weight won't move, the instinct is to what, right? We eat less, move more. But here's what caloric restriction does to thyroid function. It drops that T3, that active form. Your body perceives undereating as a stressor, as famine in the body, so it down-regulates the thyroid output to conserve energy. So the very strategy you think should help, like eating 1,200 to maybe 1,400 calories max, is telling your thyroid to slow down further. Now, pair that with perimenopause. You already have lower conversion, higher cortisol, less progesterone support, and now you're under-fueling on top of it? Your metabolism, it doesn't speed up on its own. No, it downshifts, and the weight holds or increases despite a caloric deficit. This is where it's maddening. So this metabolic adaptation layered on top of hormonal disruption, they go together. This is not a discipline problem. It is truly and purely physiological And it, we eat less or move more, right? But more cardio does not help either. You know, we're... That's the, the instinct. Like, if eating less isn't working, we need to, to train harder. More HIIT classes, more running, more sweating. But excessive cardio in this state raises cortisol further, increases reverse T3, breaks down muscle, depletes glycogen without adequate recovery, increases appetite and cravings. And with low thyroid function, recovery is already impaired. So now you're chronically sore, chronically inflamed, chronically tired, and the belly fat stays exactly where it is. Because in a thyroid-suppressed state, high-intensity training is stress your body cannot recover from Okay? So let me say that again. If your thyroid is already suppressed, high intensity training is a stressor that your body cannot recover from. All right? So if you're in perimenopause and weight loss is feeling impossible, here's some questions to ask yourself. Am I exhausted beyond what makes sense? Can I explain this? Is my body temperature consistently low, cold hands, cold feet? Is my hair thinning or falling out more? Am I constipated even with enough fiber, water? Is my brain a little foggy, like thinking through mud? Am I puffy in the morning, face, hands, ankles? Does my skin feel dry no matter what I use? Have I lost the outer third of my eyebrows? Do I feel depressed or flat without a clear reason? Am I gaining weight or unable to lose despite real effort? If multiple of those are true, this isn't just perimenopause being hard on you. Something else is likely contributing. So here's what needs to happen next. If your thyroid is impaired, even subclinically, right? You might have a normal lab test as far as your doctor is concerned because they use these huge ranges. There are specific things that need to shift before weight loss can become possible again. So let me go through this short list for you. Number one, stop under-eating. You cannot diet your way out of thyroid suppression. Your body needs adequate fuel, especially protein, to produce and convert thyroid hormone. Number two, shift from that high intensity Orange Theory class to something strength-based. Muscle supports metabolic rate. Strength training improves insulin sensitivity without chronically elevating cortisol the long... The, the way long duration, like an hour plus cardio does. Number three, address the stress load. Cortisol is directly suppressing that thyroid conversion. If sleep is broken, stress is high, recovery is low, that has to be addressed before weight loss strategies will work. Number four, get a full thyroid panel, and I mean a full one. TSH alone is not enough. You need free T4, free T3, thyroid antibodies, and in some cases, I always like to run reverse T3. Optimal matters, not just normal that fits in these two large of ranges. Number five, support nutrient cofactors. Thyroid hormone production requires things like iodine, selenium, zinc, iron, vitamin D, B12, and deficiencies in any of these, extremely common in perimenopausal women, can completely impair your function. Number six, and last one, consider whether or not hormone support is needed. Maybe you could use a little thyroid support, a little thyroid medication, or both, depending on what the full picture reveals. This is not about jumping into medication, but it's also not about suffering unnecessarily when help exists. So here's what I want you to take away from this. If your thyroid is compromised even mildly and you're in perimenopause, weight loss resistance, it's not your fault. Your body is not broken, but it's asking for a new type of support. You cannot out-discipline a slow thyroid. You cannot out-train metabolic suppression. You cannot out-restrict a body that's already in conservation mode. The answer is not less, it's more precise. More adequate nutrition, more strategic training, more recovery, more thorough testing, more personalized support. 'Cause when we address what's actually happening, when we support that thyroid function, stabilize cortisol, restore sleep, fuel the body properly with nutrition, the weight begins to shift again. Not because you finally found enough willpower or you found the perfect diet, but because you finally gave your metabolism what it needed to function, and that's the difference between fighting your body and leading it. Thank you for being here, and I will see you next time

Speaker 4 12:35

That's it for today's episode of The Balanced Hormone Solution podcast. If this resonated, don't just listen, do something about it. Make sure to subscribe so you don't miss what's coming next. And if you know another woman who's tired of feeling like a stranger in her own body, send her this way. For more support, check out the show notes. I've got resources to help you get started. Just remember, your body isn't broken. You just need the right tools. See you next time