Professor Mann said the health benefits of dietary fibre - contained in foods such as whole grains, pulses, vegetables and fruit - come from its chemistry, physical properties, physiology and its effects on metabolism.
The results? The high-fiber diet means 13 fewer deaths and six fewer cases of coronary heart disease for every 1,000 people who eat high-fiber foods, compared with those who do not. As per the data that is considered during the research, when 25-29 grams are taken each day, it got some higher intakes for the fiber.
According to the study, most people worldwide now consume less than 20g of dietary fibre a day.
A new study commissioned by the World Health Organization has found high fibre diets decrease risk of heart disease.
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However, the study found only limited support that diets with a low glycemic index and low glycemic load offered protection against type 2 diabetes and stroke. Fitness enthusiasts and health conscious people must note that foods with a low glycaemic index or low glycaemic load may also contain added sugars, saturated fats, and sodium.
To achieve optimum health benefits it's important to consume a balance of different fibres - soluble, insoluble and fermentable, and all play important roles in helping us maintain a healthy gut.
"This reduces incidence risk and mortality from a broad range of important diseases", he said.
Dietary fiber includes plant-based carbohydrates such as whole-grain cereal, seeds and some legumes.
Professor Nita Forouhi of the MRC Epidemiology Unit at Cambridge University said their research endorses United Kingdom governmental advice to eat 35 grams of fibre each day. These studies involved initially healthy participants, so the findings can not be applied to those with existing chronic diseases.
They also noted that their study looked mainly at foods rich in naturally occurring fibre, rather than synthetic fibre, such as powders, that can be added to foods. This alignment is seen beautifully for dietary fibre intake, in which observational studies reveal a reduction in all-cause and cardiovascular mortality, which is associated with a reduction in bodyweight, total cholesterol, LDL cholesterol, and systolic blood pressure reported in randomised controlled trials.