₦airaland Forum

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Naijaryder:
Choosing the right oil to cook with is a complicated business, writes Michael Mosley.

When it comes to fats and oils, we are spoiled for choice. Supermarket shelves are heaving with every conceivable option. But these days it is extremely confusing because there is so much debate about the benefits and harm that come from consuming different types of fats.

On Trust Me, I'm a Doctor we decided to look at things from a different angle by asking: "Which fats and oils are best to cook with?"

You might think it is obvious that frying with vegetable oils has to be healthier than cooking with animal fat, like lard or butter. But is it really?

To find out, we gave some Leicester residents a variety of fats and oils and asked our volunteers to use them in their everyday cooking. The volunteers were also asked to collect any leftover oil which would then be analysed.

The fats and oils they used included sunflower oil, vegetable oil, corn oil, cold pressed rapeseed oil, olive oil (refined and extra virgin), butter and goose fat.

Samples of oil and fat, after cooking, were collected and sent to Leicester School of Pharmacy at De Montfort University in Leicester, where Prof Martin Grootveld and his team ran a parallel experiment where they heated up these same oils and fats to frying temperatures.

When you are frying or cooking at a high temperature (at or close to 180C), the molecular structures of the fats and oils you are using change. They undergo what's called oxidation - they react with oxygen in the air to form aldehydes and lipid peroxides. At room temperature something similar happens, though more slowly. When lipids go rancid they become oxidised.

Consuming or inhaling aldehydes, even in small amounts, has been linked to increased risk of heart disease and cancer. So what did Prof Grootveld's team find?

"We found," he says, "that the oils which were rich in polyunsaturates - the corn oil and sunflower oil - generated very high levels of aldehydes."

I was surprised as I'd always thought of sunflower oil as being "healthy".

"Sunflower and corn oil are fine," Prof Grootveld says, "as long as you don't subject them to heat, such as frying or cooking. It's a simple chemical fact that something which is thought to be healthy for us is converted into something that is very unhealthy at standard frying temperatures."

The olive oil and cold-pressed rapeseed oil produced far less aldehydes, as did the butter and goose fat. The reason is that these oils are richer in monounsaturated and saturated fatty acids, and these are much more stable when heated. In fact, saturated fats hardly undergo this oxidation reaction at all.

Prof Grootveld generally recommends olive oil for frying or cooking. "Firstly because lower levels of these toxic compounds are generated, and secondly the compounds that are formed are actually less threatening to the human body."

His research also suggests that when it comes to cooking, frying in saturate-rich animal fats or butter may be preferable to frying in sunflower or corn oil.

"If I had a choice," he says, "between lard and polyunsaturates, I'd use lard every time."
Stir fries and other high temperature cooking

For most of the common frying oils that people use, the smoke-point usually exceeds that of standard frying temperature (180C).
However, shallow Chinese frying/cooking episodes can easily reach 250C or above, which is often greater than the smoke-point.
Moreover, although dependent on the source and fatty acid composition, lard has a smoke-point of 182C, and some extra virgin olive oils can have smoke points as low as 160C.

Lard, despite its unhealthy reputation, is actually rich in monounsaturated fats.

Our study also threw up another surprise because Prof Grootveld's team identified in some of the samples sent in by our volunteers a couple of new aldehydes that they had not previously seen in the oil-heating experiments.

"We've done some new science here," he says with a smile on his face. "It's a world first, I'm very, very pleased about it."

I'm not sure that our volunteers would have been quite so thrilled to discover their cooking had managed to generate new, potentially toxic compounds.

So what is Prof Grootveld's overall advice?

Firstly, try to do less frying, particularly at high temperature. If you are frying, minimise the amount of oil you use, and also take steps to remove the oil from the outside of the fried food, perhaps with a paper towel.

To reduce aldehyde production go for an oil or fat high in monounsaturated or saturated lipids (preferably greater than 60% for one or the other, and more than 80% for the two combined), and low in polyunsaturates (less than 20%).

He thinks the ideal "compromise" oil for cooking purposes is olive oil, "because it is about 76% monounsaturates, 14% saturates and only 10% polyunsaturates - monounsaturates and saturates are much more resistant to oxidation than polyunsaturates".

When it comes to cooking it doesn't seem to matter whether the olive oil is "extra virgin" or not. "The antioxidant levels present in the extra virgin products are insufficient to protect us against heat-induced oxidation."

His final bit of advice is always keep your oils in a cupboard, out of the light, and try not to reuse them as this also leads to the accumulation of nasty side-products.

http://www.bbc.co.uk/news/magazine-33675975

debbydee:
Thank you my sister God bless you. I tried calling you yesterday to confirm if you gotten home but you were not picking my calls. Thanks so much

Atlantian:
Listen, he cant do that. he is a pastor, he is vulnerable. What does it take to record a sextape during the session and use it to blackmail someone. Where are we again, remind me. Is this heaven ? Does it look like I came to this world to joke ? No time abeg. Its all about the money, we can talk repentance when I am 80.

Blackett:
[color=#150000]I'm shocked. . . Really, I am.


Nah. Not because of the story. But because, a self acclaimed 36 year old OND, HND holder cannot construct simple error free English, to save her own life. The story was a pain to read.

I'm having a "WTF" moment right now.[/color]

kemesty:
And more

debbydee:
Hello ma, i cant see your email address but i have sent you a PM. Kindly7 respond then we take it from there.
Secondly if you are on BBM you can add me on 25d43f96. Thanks

debbydee:
Hello ma, i cant see your email address but i have sent you a PM. Kindly7 respond then we take it from there.
Secondly if you are on BBM you can add me on 25d43f96. Thanks

killsmith:
All these things na lie.....men will always come.... Except person go nail ur picture for iroko tree in ur village.....

basigani:
Aregbesola should pay the money he's owning o

smartsales:
beautiful

debbydee:
Thank you very much for stopping by.

the price is 3500 only and i am based in lagos gbagada

RAYCOMFASHION:
Update your closest with your affordable and quality trendy Nigerian native attires.

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