PFAS, Heavy Metals & Food Contamination: What You Really Need to Know About Eggs, Dairy, Meat & Fish

Over the past few weeks, warnings about PFAS contamination in Belgium - especially around eggs - have made headlines again.

But if you zoom out, this conversation is much bigger than eggs and much bigger than PFAS alone.

We are now looking at a broader reality:

Our food can contain a mix of environmental contaminants - from PFAS to heavy metals - and understanding how they accumulate is the key to making informed, calm decisions.

In this article, I’ll help you understand:

• where these toxins are found

• which foods tend to accumulate more

• how they impact hormone health

• and what actually matters in daily life

A quick reminder: PFAS, heavy metals & why they persist

PFAS (“forever chemicals”) are highly persistent compounds used in industrial and consumer products.

Heavy metals like:

• mercury

• lead

• cadmium

come from:

• industrial pollution

• agriculture

• water contamination

What they all have in common:

• They do not easily break down

• They accumulate in the environment

• And importantly - they accumulate in living organisms

The missing piece in most conversations: bioaccumulation in fat

This is where media messaging stays too superficial: these contaminants are not evenly distributed in food.

They accumulate in fatty tissues. This applies to both animals - and humans.

In animal foods, higher concentrations are typically found in:

• egg yolks

• fatty fish

• fatty cuts of meat

• full-fat dairy (especially cheese)

• organ meats (in some cases)

Why? Because fat cells act as a storage site for toxins, particularly:

• PFAS

• dioxins

• some heavy metals

So when we talk about “contaminated foods,” we’re often really talking about: fat-rich animal products from exposed environments

Not all toxins behave the same way:

Some -like dioxins and certain pesticides - accumulate in fat, which is why they’re more concentrated in foods like cheese, egg yolks, and fatty meats.

Others, like mercury, accumulate in protein-rich tissues, which explains why large fish like tuna can be high in contamination.

And newer concerns like microplastics don’t fit neatly into either category, as they can circulate and accumulate in different tissues while also carrying other toxins.

Which animal foods contain the most contaminants?

Let’s bring clarity to this - because not all protein sources are equal.

Higher contamination risk (more frequent accumulation)

1. Large fatty fish

• tuna (especially canned tuna)

• swordfish

• shark

=> high in mercury + persistent pollutants

2. Eggs (especially from contaminated soils)

• PFAS can accumulate via soil ingestion by chickens

• concentrated in the yolk

3. High-fat dairy products (also high in glyphosate!!)

• cheese (particularly aged cheeses)

• butter 

• cream

=> fat-soluble toxin accumulation

4. Fatty cuts of meat

• especially from animals exposed to contaminated feed or soil

Moderate risk

5. Poultry (chicken, turkey)

• generally lower fat than red meat

• contamination depends heavily on:

  • feed quality - worms from contaminated soils are especially bad, grain-feed is better

  • environment

6. Farmed fish

• depends on feed quality and farming conditions

• also is much fatter than wild fish

Lower risk (relatively speaking)

7. Lean meats

• lower fat = lower storage of fat-soluble toxins

8. Low-fat dairy

• reduced concentration compared to full-fat versions

9. Plant foods

• generally much lower accumulation

• (with exceptions in highly contaminated soils)

So… are eggs worse than dairy or meat?

Not exactly. This is where nuance matters.

• Eggs can be high-risk in specific contaminated environments

• Dairy can be a more consistent source of exposure due to frequent consumption + fat content

• Fish (especially large species) often contributes more significantly to heavy metal exposure

So the real answer is: There is no single “worst” food - only patterns of exposure.

What about Belgium and surrounding regions?

As I explained in a previous article (where I discussed research by Nick van Larebeke), contamination is not evenly distributed.

It is highly localised:

• industrial areas → higher exposure

• rural, forested areas → lower (but not zero)

And importantly: Switching countries (Belgium → Netherlands → France → Germany) does not guarantee lower exposure.

How do these toxins affect hormone health?

This is where it becomes highly relevant for women in perimenopause and beyond.

PFAS are known endocrine disruptors

They can interfere with:

• estrogen signalling

• thyroid function

• metabolic health

Heavy metals can:

• increase oxidative stress

• disrupt mitochondrial function

• impair detoxification pathways

• support Grave’s disease (Hyperhtyroid autoimmune condition)

Common symptoms associated with higher toxic load

While exposure is often subtle and long-term, it may contribute to:

• fatigue

• brain fog

• weight gain (especially resistant weight)

• hormonal imbalances

• thyroid dysfunction

• cycle irregularities

• increased inflammation

Of course, these symptoms are multifactorial - but toxic load is often an overlooked piece of the puzzle.

What actually matters (and what doesn’t)

This is where I want to bring you back to a grounded, practical perspective… 

What doesn’t help:

• obsessively avoiding one specific food

• assuming imported food is “cleaner”

• trying to eliminate all exposure (impossible)

What does make a difference:

1. Diversify your diet

Avoid relying heavily on:

• daily eggs (especially from industrial areas) -> research where your eggs are coming from

• avoid tuna, swordfish, shark, farmed salmon

• high intake of one specific animal product

2. Be strategic with higher-risk foods

• limit large fish like tuna

• vary fat sources

• rotate animal proteins

• eat less egg yolk - for instance 2 whites with 1 yolk

3. Reduce overall exposure load

Often more impactful than food alone:

• water filtration (my Aquatru filters up to 96% PFAS)

• reducing food packaging exposure

• avoiding teflon cookware and gore-tex

4. Support detoxification pathways

This is where your daily habits matter most:

• fiber intake (binding + elimination)

• adequate protein

• liver support nutrients

• gut health and bile flow

The bottom line

Yes - PFAS and heavy metals in food are real concerns.

But the conversation should not be reduced to: “Are eggs safe or not?”

Instead, a more accurate and empowering perspective is:

Contaminants accumulate in the air and environment - and in the fat of animal foods - but your overall exposure, dietary patterns, and detox capacity determine the real impact on your health.

If anything, this is not a reason to panic.

It’s an invitation to:

• eat with awareness

• diversify intelligently

• and support your body’s resilience

Because long-term health is never about one food.

It’s about the bigger picture.