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Need To Know > Fitness and health > ‘I’m a Harvard-trained doctor and these foods are silently POISONING your body’
Harvard doctor reveals the common foods "silently poisoning" your body - from strawberries and bottled water to canned tuna and hot dogs, most people have no idea about the toxins.
Fitness and health

‘I’m a Harvard-trained doctor and these foods are silently POISONING your body’

Amy Walters
Last updated: March 2, 2026 9:31 am
Amy Walters Published March 2, 2026
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Dr Saurabh Sethi reveals which common foods are “silently poisoning” your body. (Jam Press/@doctor.sethi)
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A doctor who graduated from Harvard University has revealed which common foods are “silently poisoning” our bodies.

Dr Saurabh Sethi often shares his advice and expertise with his 1.4m followers on Instagram (@doctor.sethi).

He previously rated nine superfoods – including green tea and olive oil – based on how well they help to slow down ageing.

READ MORE: ‘Doctors said I was lazy and pear-shaped – Google revealed I had a hidden disease’

Now, the 43-year-old has issued a shock warning over certain common foods as they are “silently poisoning” our bodies, reports Need To Know.

In a clip, which has racked up 674,000 views and over 9,000 likes, he explains that most people are completely unaware of the toxins.

Dr Sethi, from California, US, said: “You get the most pesticide exposure from strawberries.

Harvard doctor reveals the common foods "silently poisoning" your body - from strawberries and bottled water to canned tuna and hot dogs, most people have no idea about the toxins.
Dr Saurabh Sethi. (Jam Press/@doctor.sethi)

“Certain pesticide residues may interfere with hormone signalling and add to the body’s cumulative chemical exposure over time.

“The most microplastic exposure is from bottled water.

“Microplastics are tiny particles that may accumulate in the body and are being studied for their potential effects on gut barrier health and inflammation.

“And heavy metal from canned tuna means mercury can build up in the body.

“With frequent intake, it may affect the brain and nerve function, especially when exposure becomes excessive.”

He also lists acrylamide – a chemical compound that is potentially carcinogenic – from deep fried potatoes, including crisps.

This forms when starchy foods are cooked at high temperatures.

He added: “Added chemical preservatives [come] from ultra-processed meats.

(Jam Press/@doctor.sethi)

“These additives can alter the gut microbiome and have been linked to higher levels of systemic inflammation when eaten regularly.

“And advanced glycation end products come from charred meats.

“These compounds form during charring and can promote oxidative stress.

“This is associated with faster biological ageing.

“You get the most sodium nitrate exposure from hot dogs and deli meats.

“In the body, nitrates convert into reactive compounds that may affect vascular and metabolic health when intake is frequent.

“Artificial dyes are found in colorful cereals and candies.

“And in children, synthetic food colours have been linked to hyperactivity-type symptoms; so reducing intake may help sensitive individuals.

“This isn’t about fear – it’s about awareness.

“Once you know the source, you can make smarter food choices that protect your gut, liver, hormones and long-term health.”

READ MORE: ‘I woke up with slurred speech and a droopy mouth just months before my wedding day – it was a race against the clock’

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