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Need To Know > Fitness and health > TikTok doctor reveals which cooking methods could be killing your gut with OVEN ROASTING one of the worst offenders
Harvard doctor reveals deep frying is worst for gut health - ranks kitchen gadgets from safest to harmful, warning against oxidized fats and gut-irritating compounds.
Fitness and health

TikTok doctor reveals which cooking methods could be killing your gut with OVEN ROASTING one of the worst offenders

Amy Walters
Last updated: July 15, 2025 9:05 am
Amy Walters Published July 15, 2025
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Dr. Saurabh Sethi ranking popular kitchen gadgets based on their impact on gut health. (Jam Press/@doctor.sethi)
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A doctor who graduated from Harvard University has revealed which popular kitchen appliances could be killing your gut.

Dr Saurabh Sethi, a gastroenterologist, shares his experience and knowledge with his 1.2m followers on Instagram (@doctor .sethi).

He previously shared how going to bed with wet hair could result in complete baldness.

READ MORE: ‘My 34H breasts ruined my life – I needed help showering and spent HUNDREDS on special bras’

Now, he’s ranked common kitchen cooking gadgets and methods based on how they impact the gut.

And the worst one is something most households indulge in regularly, reports Need To Know.

In the clip, which has racked up 983,000 views and over 3,000 likes, the 42-year-old explains how these cooking modes could be harming your gut microbiome, increasing bloating and triggering digestive issues.

Harvard doctor reveals deep frying is worst for gut health - ranks kitchen gadgets from safest to harmful, warning against oxidized fats and gut-irritating compounds.
Dr. Saurabh Sethi. (Jam Press/@doctor.sethi)

Dr Sethi, from California, US, rates them on a scale from 1-10.

The safest option is electric kettles, followed by steamers.

Cooking using the hob is the next best way to whip up a meal without harming your gut.

He placed microwaves at number four, with oven roasting at five, followed by instant pots, juicers, air fryers and then grilling.

The worst one, though? Deep frying.

He explains: “Most people focus on ingredients, but how you cook matters too – often in ways that are overlooked.

“The ranking may change slightly depending on what you’re cooking.

“Excess oil and high temperatures with deep frying promotes gut-irritating oxidized fats and advanced glycation end products.”

According to Healthline, this can cause inflammation, oxidative stress, Alzheimer’s, diabetes, heart disease and renal failure.

(Jam Press/@doctor.sethi)

Dr Sethi continues: “Charred meats produce compounds linked to gut inflammation and colon cancer risk.

“Air frying is better than frying, but scratched non-stick surfaces may leach harmful compounds.

“Juicers remove fibre that feeds gut bacteria and spikes sugar levels fast.

“Instant pots over-softens fibre and starchy foods, reducing the prebiotic fuel your gut microbes need.

“It breaks down resistant starch too much – so helpful for sensitive guts, but not ideal for long-term microbiome health.”

He warns that high heat from oven roasting creates gut-irritating compounds, which may disrupt the gut barrier function over time.

But the top four cooking gadgets don’t have a speck of negativity.

He adds: “Microwave ovens preserve nutrients well with minimal impact on digestion or gut health.

“And induction hobs are precise, offering clean cooking for your gut and lungs.

“Steamers retain fibre and polyphenols, which is ideal for cruciferous and leafy greens.

“Electric kettles are great for gut-supporting teas, such as ginger, fennel and peppermint.”

READ MORE: ‘I beat cancer to go backpacking at 50 and stay in hostels with 21-year-olds – I’ve got a new lease of life’

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