Working Out, Eating Well… But Still Feeling Sluggish? Let's Talk About Your Thyroid.
Brain fog, constipation, low energy, and stubborn weight. Could your thyroid be part of the picture?
You're exercising, trying to eat well, and doing the things you know are important for your health, yet you're still feeling exhausted. Maybe your digestion isn't what it used to be, you're struggling with brain fog, or despite your best efforts, the scale just isn't moving.
Sound familiar?
These are some of the most common concerns I hear from women in my practice, particularly those in their 40s, 50s, and beyond. While it's easy to chalk these symptoms up to aging, stress, or hormones declining in perimenopause and menopause, I always encourage women to look a little deeper rather than simply accepting that this is how they're supposed to feel.
There can be several reasons behind these changes, and one of the areas I like to evaluate is thyroid function.
Your Thyroid Does More Than Control Your Metabolism
Your thyroid is a small, butterfly-shaped gland located in your neck, but it has a significant influence on how your body functions. It produces hormones that help regulate how your body uses energy, affecting everything from digestion and body temperature to brain function, cholesterol metabolism, and muscle health.
When your thyroid isn't producing enough hormones, many of these processes can slow down. You might notice that you're more constipated than usual, have difficulty concentrating, feel cold when everyone else seems comfortable, or struggle with fatigue that doesn't improve with a good night's sleep.
Thyroid hormones also play an important role in heart health, muscle function, and recovery from exercise. When thyroid function is significantly reduced, you may experience muscle weakness, aches, or difficulty tolerating your usual level of activity.
What makes thyroid dysfunction tricky is that the symptoms don't always seem related. You may be dealing with digestive issues, fatigue, and changes in your weight without realizing there could be a common underlying contributor.
Signs Your Thyroid May Need a Closer Look
Some of the more common symptoms associated with an underactive thyroid include:
Feeling tired even after a full night's sleep
Brain fog, forgetfulness, or difficulty concentrating
Constipation or sluggish digestion
Unexplained weight gain or difficulty managing weight
Cold hands and feet
Dry skin or thinning hair
Muscle aches, weakness, or reduced exercise tolerance
Changes in mood
Heavier or irregular menstrual cycles
Of course, experiencing some of these symptoms doesn't automatically mean you have a thyroid problem. Low iron, inadequate protein or calorie intake, poor sleep, chronic stress, and hormonal changes can all contribute to similar symptoms.
This is why I believe it's so important to take a comprehensive look at someone's health rather than focusing on one symptom or assuming it's simply a normal part of getting older.
"My Doctor Said My Thyroid Was Normal."
I hear this quite often. A woman comes into my practice frustrated because she's experiencing fatigue, constipation, brain fog, or difficulty losing weight, yet she's been told her bloodwork looks normal.
When we review her previous labs, sometimes I find that TSH was the only thyroid marker checked.
TSH, or thyroid-stimulating hormone, is an important test and is generally the best place to start when evaluating thyroid function. It's produced by the pituitary gland and signals the thyroid to produce hormones.
However, depending on someone's symptoms, health history, and previous results, additional thyroid testing may be appropriate.
When reviewing thyroid health, some of the markers I consider include:
TSH (Thyroid-Stimulating Hormone): Helps evaluate how the pituitary gland is signaling the thyroid to produce hormones.
Free T4 (Free Thyroxine): Measures the unbound form of T4, the primary hormone produced by the thyroid gland.
Free T3 (Free Triiodothyronine): T3 is a biologically active thyroid hormone that helps regulate metabolism. Although it's not routinely needed to diagnose hypothyroidism, it may provide additional information in certain situations.
Thyroid Antibodies (TPOAb and TgAb): These markers can help identify autoimmune thyroid conditions, including Hashimoto's thyroiditis, which is one of the most common causes of hypothyroidism.
Not everyone needs every thyroid marker tested, and additional testing doesn't necessarily mean something is wrong. The goal is to determine which labs are appropriate based on symptoms, medical history, and the information we already have.
In my practice, I also review blood chemistry through a functional nutrition lens, looking for patterns and opportunities to support better health. While I consider optimal or functional ranges alongside conventional laboratory ranges, I don't use narrower ranges alone to discover thyroid dysfunction.
What About Menopause? Could That Be Part of the Problem?
Absolutely, and this is where understanding the bigger picture becomes especially important.
Many symptoms associated with thyroid dysfunction overlap with those experienced during perimenopause and menopause. Fatigue, brain fog, weight changes, constipation, sleep disturbances, and changes in mood can occur during hormonal transitions, making it difficult to distinguish what's driving what.
As estrogen and progesterone fluctuate, women may experience changes in sleep quality, energy, body composition, and digestion. These changes don't necessarily mean the thyroid is underactive, but thyroid conditions can develop during the same stage of life.
For some women, it's a combination of factors rather than one specific issue.
This is why I don't believe every symptom should automatically be attributed to menopause. Hormonal changes are real, but they shouldn't prevent us from exploring other possible contributors, particularly when symptoms are persistent or affecting quality of life.
Supporting Your Thyroid Through Nutrition and Lifestyle
Your thyroid doesn't function in isolation. Adequate nutrition, sleep, recovery, and overall metabolic health all contribute to how well your body functions and how you feel day to day.
While nutrition and lifestyle changes can't replace medical treatment when someone has a thyroid disorder, they can play an important role in supporting overall health.
Here are several areas I focus on when working with clients.
1. Make Sure You're Eating Enough Protein and Overall Calories
Protein becomes increasingly important as we age because it helps preserve muscle mass, supports recovery, and contributes to metabolic health. This is particularly relevant for women navigating perimenopause and menopause, when maintaining muscle can become more challenging.
I also see women who are exercising consistently but may not be eating enough to support their activity levels. Chronic underfueling can contribute to fatigue, reduced recovery, and changes in certain hormones, making it important to evaluate overall calorie intake rather than assuming the solution is to exercise more or eat less.
2. Pay Attention to Nutrients That Support Thyroid Function
Several nutrients are involved in normal thyroid hormone production and metabolism, including iodine, selenium, iron, and zinc.
Iodine is required to make thyroid hormones, while selenium helps support enzymes involved in thyroid hormone metabolism. Iron and zinc also contribute to normal physiological processes related to thyroid health.
However, this doesn't mean everyone should start taking a thyroid supplement. Nutrient needs vary, and excessive intake of certain nutrients, particularly iodine, can actually worsen thyroid problems in susceptible individuals.
I prefer evaluating dietary intake, symptoms, and relevant blood markers before making recommendations so that supplementation is targeted rather than based on guesswork.
3. Prioritize Sleep, Exercise, and Recovery
Exercise is one of the best things we can do for long-term metabolic health, especially strength training, which helps preserve muscle mass as we age.
But exercise is only one part of the equation. If you're constantly exhausted, sleeping poorly, and struggling to recover, adding more workouts isn't necessarily going to improve how you feel.
I encourage clients to think about movement, nutrition, sleep, and recovery as pieces of the same puzzle. A balanced approach can support energy, body composition, and overall health without constantly pushing the body harder.
4. Don't Ignore Changes in Your Digestion
Constipation is a concern I discuss frequently with clients, and there are many potential reasons it can develop. Inadequate fiber, poor hydration, medications, changes in routine, and gastrointestinal conditions can all contribute.
Thyroid function is another consideration because thyroid hormones help regulate intestinal motility. When thyroid hormone levels are low, digestion can slow, sometimes leading to persistent constipation.
Rather than simply treating constipation as an isolated symptom, I like to understand what may be contributing to it so we can develop a more effective approach.
5. Look Beyond a Single Lab Marker
When someone comes to me struggling with low energy, brain fog, or unexplained weight changes, thyroid testing may be one part of the evaluation, but it's rarely the only area I consider.
Depending on their symptoms and health history, I may also review:
Vitamin B12 and folate
Lipid panel
Additional markers based on individual health concerns
These markers can provide valuable information about nutritional status, metabolic health, and other potential contributors to fatigue or changes in how someone feels.
The goal isn't to order as many tests as possible. It's to gather the information that can help us better understand what's happening and identify meaningful opportunities for improvement.
The Bottom Line: You Deserve to Understand Why You're Feeling This Way
If you're working out, eating well, and doing your best to take care of yourself but still feel sluggish, I don't want you to assume that's simply what happens as you get older.
Your thyroid may be contributing to your symptoms, or there may be other factors worth exploring, such as hormonal changes, nutrient deficiencies, inadequate recovery, or changes in metabolic health. Sometimes several of these things are happening together.
In my functional nutrition practice, I take the time to review bloodwork, nutrition, lifestyle habits, and health history to better understand the patterns that may be influencing how someone feels. When lab findings or symptoms suggest a possible medical condition, appropriate evaluation with a healthcare provider is essential.
For me, prevention is about recognizing patterns early, understanding the factors we can influence, and making informed changes that support long-term health.
Because feeling good isn't just about being told your labs are normal. It's about understanding your body and giving it the support it needs.
If you're feeling sluggish and aren't sure why, I'd love to help you take a closer look.
Discover the why. Transform your health. Book your free 15-minute consultation at What Is Health
This article is intended for educational purposes and does not replace individualized medical evaluation or treatment. Thyroid conditions should be evaluated and managed with an appropriate licensed healthcare professional.
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