.But a body of new evidence is turning the tide and changing the advice
.Dietitian Dr Trudi Deakin's new book encourages a diet high in saturated fat
.Eat Fat: Step-by-Step Guide To Low Carb Living is the result of research examining the recent studies on the subject
.No evidence that saturated fat causes heart attack or stroke, she said
.Saturated fat leaves you feeling fuller for longer and less inclined to snack
.High-carb diet promotes production of weight-promoting hormone insulin
.Excess carbs in the body are converted into fat which sits around organs
It has long been the modus operandi of dieters around the world - cut the fat and opt for 'lighter' foods to try and shift the pounds.
The NHS itself recommends eating plenty of potatoes, bread, rice and pasta with some milk and diary foods, but advises opting for low-fat options.
But now a growing body of evidence is turning the tide on that advice.
A vast collection of studies are changing the dieting landscape, as experts open their eyes to the real enemy targeting our waistlines - carbohydrates.
Now one dietitian, Dr Trudi Deakin, has revealed her diet is 82 per cent fat - and claims she has never felt healthier.
The founder of X-PERT Health, a charity that offers educational programmes on diabetes to NHS professionals, Dr Deakin regularly performs in-depth literature reviews of recent studies to ensure the information they give is up-to-date.
'More and more evidence is coming out in favour of low carbohydrate diets,' she told MailOnline.
A year ago, she was asked to speak at the annual Diabetes UK conference in a debate against another researcher on the topic 'We should stop promoting carbohydrates in people with diabetes'.
Dr Deakin said: 'Traditionally, the advice has been high-carbohydrate, low-fat diets are best.
'I won the debate and was amazed afterwards when I started being contacted by diabetic patients and GPs who had started a low-carb diet and found it to be successful.
'Despite that, patients told me their diabetes care team were still promoting a high-carb diet.
'GPs were telling me for years they had seen patients coming through on a low-fat high-carb diet complaining it wasn't helping them.
'I started to do some additional research last summer, reading lots of fantastic books and studies.
'I now have a very clear understanding of how a high-carb diet has fuelled the obesity epidemic.'