Case Study: Understanding Thyroid Autoimmunity, Low Cortisol & Hormone Imbalance in a Woman in Her Early 40s

When Claire first came to see me, she was in her early 40s and felt completely defeated by her health. She had been gaining weight for years, felt tired all the time, and was becoming increasingly depressed.

The hardest part for her emotionally was that she no longer felt comfortable exercising - something she used to love.

She told me she felt ashamed of her weight, frustrated by the lack of progress, and confused about why nothing was working anymore. She felt stuck in a body that didn’t feel like hers.

Although she had been diagnosed with an underactive thyroid, her GP insisted her medication was “working fine.” But her symptoms clearly said otherwise.

Step 1: Getting Proper Testing - Not Guessing

I explained that if she wasn’t feeling well, we needed to understand why:

• Was her medication the right dose?

• Was the problem autoimmune? (Hashimoto’s often goes undiagnosed by GPs)

• Were her nutrients supporting thyroid function?

• Were her hormones shifting into early perimenopause?

• Was her fatigue related to thyroid, cortisol, or both?
  

So we carried out two comprehensive tests:

A complete thyroid & nutrient blood panel
Including antibodies, conversion markers, and essential nutrients like B12, iron, folate, vitamin D and inflammatory markers.

A full hormone panel
Assessing oestrogen, progesterone, adrenal output (cortisol), and hormone metabolites.
This allowed us to look at the whole picture, not just one number on a blood test.

Step 2: The Results Were a Breakthrough

She had elevated thyroid antibodies → Hashimoto’s
This meant her thyroid was autoimmune, not simply “underactive.”
Her immune system was attacking her thyroid tissue, which is why:

• Her medication wasn’t solving the issue

• She still felt exhausted and low

• Weight wouldn’t shift

• She was losing confidence and motivation

I recommended she seek referral to an endocrinologist familiar with autoimmune thyroid conditions, and in the meantime, we began addressing the immune triggers nutritionally.

Her cortisol curve was completely flatlined
Cortisol is often misunderstood - people think of it as a “stress hormone,” but it is also:

• Your main energy hormone

• Essential for anti-inflammatory processes

• Necessary for blood sugar stability

• Important for weight management & muscle maintenance

Her cortisol was low all day, which explained:

• Constant exhaustion

• Low mood

• Inflammation

• Difficulty losing weight

• Feeling unable to exercise

• Brain fog

• Crashing in the afternoons

This test result helped her feel validated - there was a real physiological reason she felt so low.

Her oestrogen was on the high side
This is extremely common when:

• Body fat is higher

• Detox pathways are sluggish

• Stress hormones are imbalanced

• Thyroid function is compromised

Excess oestrogen can cause:

• Weight gain around hips/stomach

• Heavy periods

• Mood swings

• Breast tenderness

• PMS-like symptoms

Her detoxification pathways also showed signs of being overloaded, meaning her body couldn’t clear hormones efficiently.

Putting It All Together: Now We Knew Exactly What to Do

This combination - autoimmune thyroid + low cortisol + sluggish detox + high oestrogen gave us a clear roadmap for an action plan.

Our goals became:

• Reduce autoimmune activation

• Support adrenal health & rebuild her cortisol curve

• Improve detoxification so she can clear excess oestrogen

• Stabilise blood sugar to support thyroid and mood

• Help her feel safe re-entering exercise gradually

But because she was exhausted and overwhelmed, we had to start gently.

Step 3: Building a Plan That Met Her Body Where It Was

Supporting cortisol naturally
We used:

• Regular, balanced meals

• Foods supportive of adrenal health

• Adaptogenic herbs (in forms she tolerated)

• A gentler morning routine

• Caffeine timing adjustments

• Strategies to reduce inflammatory load

• Calming practices for nervous system support

This helped her body slowly rebuild its ability to produce cortisol when it was needed.

Balancing her thyroid and reducing inflammation
We focused on:

• Removing inflammatory foods that can worsen autoimmune activity (e.g. gluten for Hashimoto’s)

• Increasing selenium, zinc, iodine (when safe), iron, and omega-3

• Rebuilding nutrient stores essential for thyroid hormone production

• Supporting gut lining health - essential for autoimmunity

• Lowering systemic inflammation

She noticed improvements quickly, especially in her mood.

Supporting detoxification pathways
To help her clear oestrogen more effectively, we used:

• Cruciferous vegetables

• High-fibre eating

• Hydration, minerals, and electrolytes

• Herbs and spices to support liver function

• Different meal timings to regulate insulin and inflammation

This also supported weight release, which had been stuck for years.

Step 4: Lifestyle Tailored to a London Commute

Her lifestyle was demanding - early mornings, long commutes into London, irregular eating patterns, and morning fasting.

Fasting can work for some people, but in cases of underactive thyroid and imbalance of adrenals, it can worsen symptoms dramatically, and it is not recommended. 

In her case, morning fasting was:

• Draining her energy

• Draining adrenals even more 

• Increasing inflammation

• Worsening weight gain

• Making her feel more depressed

We needed to shift towards:

• Eating something stabilising in the morning

• Managing blood sugar throughout the day

• Protecting her adrenal glands from stress overload

This created an entirely new baseline for her body.

The Transformation
Over time, as her thyroid, cortisol, and hormonal pathways were supported:

• Her energy improved noticeably

• Weight began to shift after years of being stuck

• She felt more emotionally stable

• Brain fog lifted

• She began exercising again without fear or shame

• Her confidence grew

• She felt more like “herself” again

She said at one point:

“This is the first time someone has explained what is actually happening in my body. I finally feel understood.”