#OpMurderForHire – Cooking with vegetable oil increases the risk of heart disease, type 2 diabetes & cancer

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The toxic truth about vegetable oil: Cooking with ‘healthy’ fats increases the risk of heart disease, type 2 diabetes and cancer

  • Dr Aseem Malhotra is a consultant cardiologist, advisor on the National Obesity Forum and contributor to the Hippocratic Post
  • Cooking vegetable oils at high temperatures changes chemical compounds
  • Studies found it can produce potentially harmful levels of adelhyde
  • Experts: Dairy products and olive oil are more beneficial to heart health 

When I go to my local curry restaurant, I always ask the waiter to make sure my chicken jalfrezi, spinach curry and lentil daal is cooked in ghee, not vegetable oil.

They know me now so I don’t get rolling eyes and shrugs any more.

It helps that I leave a generous tip. But it’s worth it.

As a cardiologist with an interest in obesity and heart health, there is no way I am going to put my health at risk by eating poisonous compounds that are created when vegetable oils are cooked at high heat.

When Dr Aseem Malhotra orders a lentil daal (pictured), he insists it is cooked in ghee, not vegetable oil. This is because vegetable oils can produce dangerous chemical compounds when cooked at high temperatures

When Dr Aseem Malhotra orders a lentil daal (pictured), he insists it is cooked in ghee, not vegetable oil. This is because vegetable oils can produce dangerous chemical compounds when cooked at high temperatures

Unfortunately, curry lovers in the UK, and the vast majority of Indians on the subcontinent are doing just that – they have abandoned traditional ghee (a kind of clarified butter) in favour of ‘healthier’ vegetable oils.

The outcome of this trend has been disastrous – driving higher rates of heart disease, type 2 diabetes and cancer.

GOLDEN RULES FOR SAFE COOKING

So what can you do to minimise any potentially harmful effects?

Professor Martin Grootveld, works in bio-analytical chemistry at De Montfort University in Leicester, came up with the following tips.

  • Cut down on frying, particularly at high temperatures or above the so-called ‘smoke point’. If you are frying, minimise the amount of oil you use.
  • To reduce production of harmful aldehydes, go for a product high in mono or saturated fat (preferably greater than 60 per cent) and low in polyunsaturates (less than 20 per cent).
  • The ideal compromise for cooking purposes is olive oil ‘because it is about 76 per cent monunsaturates, 14 per cent saturates and 10 per cent polyunsaturates’.
  • If cooking, there is no health benefit paying extra for extra virgin olive oil.
  • In view of its high saturate content, coconut oil is also recommended.
  • Always keep your oils in a cupboard, out of the light, and try not to reuse oils because that leads to the accumulation of nasty side products.

Studies now show that sunflower oil, corn oil and other vegetable oils are unstable at high temperature and quickly break down into toxic adelhyde which is linked to an increased risk of developing getting cancer among other things.

A recent study showed that cooking in vegetable oil for just 20 minutes, produced 20 times the permitted levels of adelhyde recommended as a maximum limit by the World Health Organisation.

When I see someone who is otherwise healthy frying healthy kale and tofu in sunflower oil, I despair how good intentions can go so wrong.

For years, we have thought that vegetable oils, including sunflower oil and corn oil, were better than butter and animal based fats.

But the tide of opinion has changed and the latest scientific evidence reveals that dairy products actually protect against heart disease and type 2 diabetes.

Sadly, the news has come too late for the millions of people who now shun full-fat milk and butter because they think it is bad for them.

I now always advise my patients to actively avoid eating any industrial vegetable oils.

Cold pressed extra virgin olive oil however will protect your heart and give you a bit of a boost when it comes to antioxidants which help to mop up damaging free radicals in the blood.

But the vast majority of vegetable oils are not going to help, despite claims that they help reduce cholesterol.

A recent BMJ analysis found that even if cholesterol levels do decline on a diet of vegetable oil margarines, there is no knock-on benefit to heart health and a more worrying trend to increasing the risk of death.

So my message is drizzle your cold pressed olive oil on your chorizo to your (healthy) heart’s content but stick to butter (and ghee) when you want to create a bit of a sizzle.

This article has been reproduced with the permission of The Hippocratic Post

WHY COOKING OIL AT HIGH TEMPERATURES CAN STOP THEM BEING ‘HEALTHY’ – By Michael Mosley

The problem is that when fats and oils are heated they change, and as they do so they produce chemicals that may cause heart disease and cancer.

Take olive oil, for example, championed by so many as the reason why the lucky folk of the Mediterranean live such long, healthy lives.

When fats and oils are heated they change, and as they do so they produce chemicals that may cause heart disease and cancer

When fats and oils are heated they change, and as they do so they produce chemicals that may cause heart disease and cancer

This has a lower ‘smoke point’ – the point at which an oil begins to smoke and change – than some other oils, meaning it will start to alter more quickly.

As olive oil heats up and reaches its smoke point, the beneficial compounds start to degrade, and potentially health-harming compounds form.

At least, that was the accepted theory before we began our research – that the lower the smoke point, the more dangerous the oil as the more quickly it will start producing harmful chemicals when heated.

The dangers of turning up the heat

It is this assumption that has consistently seen health experts warn people not to cook with olive oil and advise that vegetable and sunflower oil are safer for cooking as they have a higher smoke point, so can resist greater heat without producing cancer-causing agents.

That point is 225c for sunflower oil and 230c for corn oil, compared to 160c to 190c for extra virgin olive oil.

A study found that cooking fats at high temperaturesleads to oxidation - they react with oxygen in the air to form substances such as aldehydes and lipid peroxides - linked to heart disease and cancer

A study found that cooking fats at high temperaturesleads to oxidation – they react with oxygen in the air to form substances such as aldehydes and lipid peroxides – linked to heart disease and cancer

That was the theory when we began our research.

To test it out we asked some volunteers, local residents in Leicester, to use a variety of fats and oils, provided by us, in their everyday cooking.

The volunteers were asked to collect any leftover oil after cooking, which we would then have analysed.

They were given sunflower oil, vegetable oil, corn oil, cold-pressed rapeseed oil, olive oil (refined and extra virgin), butter, goose fat and lard.

Samples were then sent to De Montfort University in Leicester, where Martin Grootveld, professor of bio-analytical chemistry and chemical pathology, got to work in the lab analysing their contents.

His team also ran a parallel experiment where they heated up these oils and fats to frying temperatures.

The findings were surprising, to say the least.

Indeed, for many who have followed traditional advice on cooking with oils and fats it will prove to be a case of ‘everything you think you know is wrong’.

What about olive oil?

Cooking with olive oil could be better than was previously thought, a study found

Cooking with olive oil could be better than was previously thought, a study found

Is cooking with olive oil a no-no? Not according to Professor Grootveld.

In fact, it is, on balance, unquestionably the best compromise.

Sunflower oil, supposedly the healthier alternative, is far worse. Even lard, so demonised it has entered common usage as an insult, is preferable to sunflower oil and its closely related cousin, corn oil.

To understand why, we must look closely at what happens to fats and oils when heated to a high temperature.

They undergo what is called oxidation: they react with oxygen in the air to form substances such as aldehydes and lipid peroxides. At room temperature something similar happens, though more slowly.

When fats go rancid they have been oxidised, and it results in the same by-products. It is these aldehydes they form that are the problem.

Consuming or inhaling them, even in small amounts, has been linked to increased risk of cancer and heart disease.

‘We found that oils which were polyunsaturated-rich – corn oil and sunflower oil – generated very high levels of aldehydes,’ Professor Grootveld told me.

This surprised me. Like so many others, I had always thought of sunflower oil as being healthy.

‘Sunflower and corn oil are fine, but only as long as you don’t subject them to heat, such as frying or cooking,’ said Professor Grootveld.

‘It’s a simple chemical fact that something which is thought to be healthy for us is converted into something that is unhealthy at frying temperatures.’

Aldehydes, which are known promoters of cancer, heart disease and dementia when eaten or inhaled, were present in levels up to 20 times higher than recommended by the World Health Organisation.

Not only that, but Professor Grootveld’s team also identified two previously unknown aldehydes in the samples of these oils – a world first and cause of some excitement for scientists, but bad news for consumers.

Cooking with sunflower oil and corn oil was found to produce even more toxic compounds than ever before

Cooking with sunflower oil and corn oil was found to produce even more toxic compounds than ever before

Put simply, cooking with these oils is producing even more toxic compounds than has ever before been realised. In contrast, the olive oil and cold-pressed rapeseed oil produced far fewer aldehydes, as did butter and goose fat.

The reason being that these fats are richer in monounsatured and saturated fats, and are much more stable when heated.

‘Far lower levels of toxic compounds were generated by these oils and the compounds that were are actually less threatening to the human body,’ says the professor.

And as one in the eye for those who have eschewed old-fashioned fats, his research also suggests that when it comes to cooking, frying in animal fats may be preferable to sunflower or corn oil.

Toxic by-products

The study showed that cooking in vegetable oil for just 20 minutes produced potentially dangerous levels of toxic compounds

The study showed that cooking in vegetable oil for just 20 minutes produced potentially dangerous levels of toxic compounds

His personal cooking choice is unequivocal. ‘If I had a choice between lard and polyunsaturates, I’d use lard every time,’ he says.

Staying true to the science, it must be stressed that as long as they are not heated, polyunsaturated fats (vegetable and sunflower oils) are still seen as a healthy option.

These fats reduce bad cholesterol and lower the risk of stroke and heart disease.

And while the most stable fats of all are the saturated ones, such as butter, these should still be used sparingly as they can increase bad cholesterol and the risk of narrowed arteries and heart disease.

So far, so interesting, but the discoveries were not over.

Along the way our study had thrown up additional bad news about the destructive compounds hidden in our food – even storing oils in the wrong way can change them, as sunlight creates the same damaging chemical reactions as heat, only more slowly.

So storing oils in a dark cupboard is highly recommended to avoid formation of these dangerous by-products.

The research hasn’t just changed my thinking on oils – it’s changed the way I use them, too. I am considering giving lard a try – and I never thought I would hear myself say that.

Source: http://www.dailymail.co.uk/health/article-3574810/The-toxic-truth-vegetable-oil-Cooking-healthy-fats-increases-risk-heart-disease-type-2-diabetes-cancer.html

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