Episode Details

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Are pumpkin seeds messing with your hormones? A viral claim says yes, and it comes with studies attached. So I tracked them down and read them. What I found: a test on cancer cells in a dish, a study on rats with their ovaries removed, and a computer simulation. Not one of them looked at people eating seeds.

In this episode of Food Code Matrix:

• How much zinc is really in a handful of pumpkin seeds, and how much it takes to cause copper problems

• Why the real zinc risk lives in supplements, not snacks

• What lignans (plant oestrogens) are, and what the research on them actually tested

• The largest human trial: 1,431 men, 12 months, and what it found

• Why your gut bacteria decide how much of these compounds you absorb

• The flaxseed advice that contradicts the whole claim

• Three simple steps for eating pumpkin seeds without worry

The one question to ask next time a food claim comes with studies attached: were they done on people?

Chapters

0:00 The claim

0:45 Welcome to Food Code Matrix

1:24 Why this matters: pumpkin seeds are everywhere

2:25 The claim, laid out fairly

3:21 How much zinc is really in a handful

4:13 The copper problem and where it really lives

5:59 The testosterone myth

6:21 Halfway checkpoint

6:48 Lignans: the plant compounds behind the fear

7:41 Following the paper trail: cells, rats and a computer

9:51 What happens in actual humans

11:12 Your gut bacteria decide

12:06 The flaxseed twist

12:42 What I'd actually do: three steps

13:28 The limits of the evidence

13:54 The answer, and the one question to ask

14:36 Sources and next episode

Sources

• NIH Office of Dietary Supplements, Zinc: Fact Sheet for Health Professionals (updated January 2026)

• Richter et al., Nutrition and Cancer, 2013. DOI: 10.1080/01635581.2013.797000

• Phytotherapy Research, 2019. DOI: 10.1002/ptr.6280

• Sicilia et al., Journal of Agricultural and Food Chemistry, 2003. PMID: 12590454

• Vahlensieck et al., Urologia Internationalis, 2015. DOI: 10.1159/000362903

• Vahlensieck et al., Clinical Phytoscience, 2022, 8:13

• Hullar et al., Cancer Epidemiology, Biomarkers & Prevention, 2015. DOI: 10.1158/1055-9965.EPI-14-0262

Heard something scary about a food? Tell me and I'll check the research.

Food Code Matrix: what food actually does to your body. Hosted by Çağdaş İNAL.

This podcast is for educational purposes only and is not medical advice.