Diet debate: Is butter back and is sat fat good? Media playback is unsupported on your device. Media caption. Is butter back? I love butter - a scraping of it on a slice of toast is a thing of joy. So when a series of newspaper headlines declared saturated fat is not as bad as once thought and that . The World Health Organization's advice is to have no more than 1. The argument has been that sat fat increases the amount of bad cholesterol in the blood, although it also increases the good type too. The bad cholesterol furs up arteries and ultimately leads to a heart attack or stroke. Meanwhile trials of statins show cholesterol- lowering drugs can reduce the risk of a heart attack. More from our Diet Debate series: Read: Is breakfast a waste of time? Watch: How healthy is your breakfast? Read: Low- fat or high- fat - does it matter? Confusion? But getting the best evidence in nutrition is always a bit of nightmare. Some studies rely on food questionnaires asking people what they ate in the past year and then seeing what happened decades later. Now I can't tell you what I had for dinner three weeks ago and diets also change with time. And it's ever so slightly unethical to lock people up and experiment with their diets for decades to see if they have a heart attack. So the evidence ends up being a patchwork quilt of studies that gives an overall impression that saturated fat is bad. They followed patients who had a high salt intake and sleeping problems for three months, after giving them advice to cut back on salt in their diet. A balanced diet contains the different nutrients in the correct amounts to keep us healthy. Certain foods are not necessarily 'bad' for us, but eating too much of. Tar causes cancer of the lungs, mouth and throat. It coats the surface of the breathing tubes and the alveoli. This causes coughing and damages the alveoli, making it. The World Health Organization's advice is to have no more than 10% of total calories coming from saturated fat. The argument has been that sat fat increases the. Image copyright. Thinkstock. Image caption. A barbecue is sat fat overload. Public Health England, which advises people to cut down on saturated fat, says one of the key pieces of science on which they base their recommendations on is a review of 1. However, even this starts to show why there can be confusion about saturated fat. It showed no impact on deaths from heart disease or any other cause of dying. And the analysis concludes that if you cut saturated fat out of your diet and replace it with carbohydrates or protein then it makes no difference to your risk of a heart attack. Dr Lee Hooper, who led the study at the University of East Anglia, said: . Polyunsaturated fat - Found in oily fish, vegetable oils and seeds. Trans fat - Found in biscuits, cakes and margarines. Source: British Heart Foundation. I put it to Public Health England's chief nutritionist, Dr Alison Tedstone, that just telling people to cut saturated fat was too simplistic. She was adamant that saturated fat is a bad thing in our diets but . Butter's redemption? But some have argued that even this is wrong and that butter and other foods rich in saturated fat belong in a healthy diet. A study by the University of Cambridge in 2. But Dr Forouhi warned there needed to be a stronger focus on not what should be cut from the diet, but with what it should be replaced. The study could not take that into account. She said saturated fat had become a . Common ones include palmitic acid (1. When you look at the levels of the different saturated fatty acids that end up in the blood then interesting patterns start to emerge. People with higher levels of 1. But those with more saturated fatty acids with a length of 1. And Dr Forouhi added: ? Should cheese, yoghurt, whole milk and butter should be firmly on the menu? Media playback is unsupported on your device. Media caption. How healthy is your breakfast choice? Dr Forouhi warned that it was dangerous to take her early evidence and make such pronouncements. Or equally it could come to nothing. Dr Forouhi concluded: .
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