FIBERS ARE IMPORTANT
The last ten years have shown that the body metabolizes fructose quite different than easy glucose. Fructose is deflected selectively towards liver and to form fat. In the liver, fructose is metabolized to provide one of the triglycerides bricks. A diet rich in fructose stimulates directly the liver to produce triglycerides, which are just as dangerous as bombing liver with insulin. Fructose can have the same effect as frequent secretion of insulin that occurs after frequent meals.
Extensive research have shown that fructose can produce resistance towards insulin, and in long term produces atherosclerosis.
Feeding the rats with fructose – in doses comparable to those of human – lead to the development of insulin resistance, even if the animals remain thin.
At the University of Toronto, Canada, feeding the hamsters, which have lipid metabolism very humanlike with a diets rich in fructose, resulted in hypertriglyceridemia and resistance to insulin. In 2001, at the Nutrition Clinic of the University of Minnesota, Minneapolis, 24 healthy volunteers were fed for 6 weeks with a diet in which 17% of total energy intake came from fructose. Over 27 million Americans consume a daily similar amount or even larger. After 6 weeks, the volunteers received a glucose sweetened diet and nearly total lack of fructose. The results were dramatic, especially in men who proved to be more sensitive than women to fructose. Fructose diet produced high levels of triglycerides compared with glucose diet. Even more important was the finding that the fructose diet, blood triglyceride level was the highest immediately after meals, when these fats are most harmful for arteries.
In beverages manufacture are used very high amounts of fructose because is sweeter than glucose. Nutritionists believe that sugary drinks, consumed in large quantities, are the most worrying component of our diets. For several years, the food industry uses an inexpensive sweetener, corn syrup, which virtually is pure fructose. Between 1975 and 1990 in US the consumption of corn syrup fructose increased 10 times. “Metabolic effects on population might not be noticed, “writes someone from the National Institute For Aging Study in Baltimore, USA, “but give fructose for a few decades, to exercise its metabolic disaster, and the next generation of epidemiologists will record the consequences’’.
Glucides are not only the main source of energy of the human body, but they play an important role in the process digestion too.
Fibers – ballast substances in foods of plant origin or non-starch polysaccharides – are absolutely necessary for the transport and nutrient substances absorption in the digestive tube.
Already in 1971, the english physician Burkitt claimed that by regulate the intestinal transit and faecal volume, fiber diet play a role in the prevention of colonic cancer. Numerous studies have in particular confirmed that consumption of whole grains is associated with a reduced number of bowel cancers.
The Health World Organization recommends for adults a daily intake of 27-40 grams of fiber, ie 15-22 g per day for 1000 kcal consumed. For those who consume between 2,000 and 2,800 kcal it is recommended 40-62 grams of fiber per day. Total vegetarians consume, on average, 45-50 g of fiber per day, ovo-lacto-vegetarian, about 35 g and omnivoresor non-vegetarians 10-15 g, which is much too little. It believes that increased fiber intake by real vegans contribute to a large extent, to the benefits presents this way of alimentation.