the science behind feeling better

the context to make your own choices

Isabelle Feldhaus, PhD

Population health scientist and health economist. My story →

🩸 Does a normal CBC rule out iron deficiency in women?

Plus what endoscopy finds in young women with low iron, sleep gummies worth eight minutes, and two nutrients tied to fewer hip fractures.

Oct 13, 2026

•

3 min read

ferritin

💊 Does magnesium do anything for your iron?

Plus why your iron pills might be stalling, the soy that helps some women and not others, and what actually stops BV coming back.

Oct 7, 2026

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4 min read

magnesium

ferritin

🧪 Why "Normal" Iron Often Isn't

The "normal" range on your bloodwork was built on a population that included iron-deficient people.

May 19, 2026

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2 min read

🦴 Did Our Ancestors Really Get More Calcium Than We Do?

Plus soy and hot flashes, a GLP-1 red flag surfacing in women, and a cortisol test you can now do at home.

Sep 29, 2026

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4 min read

coffee

📣 It's FINALLY happened: the recommended ferritin cutoff for women moved up to 30

Plus diagnosing anemia without a needle, 41 extra minutes of sleep with a catch, and whether "ferritin face" is real.

Sep 22, 2026

•

3 min read

ferritin

Most Popular

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🩸 What Happens to Your Iron Levels After Menopause?

How the hormonal shift at menopause changes your iron metabolism.

Mar 17, 2026

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4 min read

🦴 How Do You Actually Increase Bone Density?

Ten things claim to build or protect your bones. Here's the ranked order of what the evidence shows can make the biggest difference.

Jul 14, 2026

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4 min read

💊 GLP-1s Help Us Lose Weight. What Else Are They Doing?

The same mechanism that drives weight loss also affects iron, vitamin D, B vitamins, and lean mass, and there are no clinical guidelines yet for monitoring it.

May 12, 2026

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2 min read

🧬 What Makes Iron So Different in Women and Men?

This mechanism shaping women's iron stores is rarely discussed.

May 26, 2026

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2 min read

🦴 Osteoporosis Is Silent. But Are There Warning Signs?

What calcium deficiency actually feels like — and why it's so easy to miss.

Mar 3, 2026

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5 min read

🥱 What Actually Helps After a Bad Night of Sleep?

Sleep deprivation affects women differently — and some bad nights aren't like others.

Jun 2, 2026

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3 min read

Decode Your Labs

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🧪 Why One Test Isn't Enough

What your doctor didn’t test for could be draining your energy.

May 27, 2025

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7 min read

🩸 The Iron Tests Every Woman Should Get

Serum iron isn’t enough. Learn the full panel you should be asking for.

Jun 6, 2025

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10 min read

🧪 Transferrin Saturation & TIBC—What Most Doctors Don’t Explain

The lab results that reveal iron deficiency even when ferritin looks fine.

Jun 24, 2025

•

7 min read

🧪 Why "Normal" Iron Often Isn't

The "normal" range on your bloodwork was built on a population that included iron-deficient people.

May 19, 2026

•

2 min read

🩸 What Does an Elevated Ferritin Result Actually Mean?

Why elevated ferritin is rarely about iron overload and what it's more commonly pointing to in women.

Apr 7, 2026

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4 min read

🩸 Low B12 vs Low Iron: The Symptom Split

How to tell which deficiency is wrecking your energy (and what to ask for).

Feb 3, 2026

•

5 min read

the science behind feeling better

🩸 Does a normal CBC rule out iron deficiency in women?

💊 Does magnesium do anything for your iron?

🧪 Why "Normal" Iron Often Isn't

🦴 Did Our Ancestors Really Get More Calcium Than We Do?

📣 It's FINALLY happened: the recommended ferritin cutoff for women moved up to 30

Most Popular

🩸 What Happens to Your Iron Levels After Menopause?

🦴 How Do You Actually Increase Bone Density?

💊 GLP-1s Help Us Lose Weight. What Else Are They Doing?

🧬 What Makes Iron So Different in Women and Men?

🦴 Osteoporosis Is Silent. But Are There Warning Signs?

🥱 What Actually Helps After a Bad Night of Sleep?

Decode Your Labs

🧪 Why One Test Isn't Enough

🩸 The Iron Tests Every Woman Should Get

🧪 Transferrin Saturation & TIBC—What Most Doctors Don’t Explain

🧪 Why "Normal" Iron Often Isn't

🩸 What Does an Elevated Ferritin Result Actually Mean?

🩸 Low B12 vs Low Iron: The Symptom Split

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