Why choose high-fibre foods?

Sandra — Wed, 30 Dec 2009 07:48:01 +0000

In recent years, the message from medical research has become increasingly clear; a diet rich in high-fibre foods (such as fruits, vegetables and wholegrain cereals) protects against several common disease conditions. It also assists in controlling weight as high-fibre foods are ‘calorie bargains’, that is wholesome, low-calorie substitutes for fatty foods.
Several epidemiological studies have suggested a protective effect of fibre-rich foods in populations with low rates of bowel cancer. Scientists are particularly encouraged by the findings of Japanese research based on a very large population sample showing a direct relationship between daily consumption of green and yellow vegetables and low rates of cancer at most sites.
Many Australians eat far less fibre than the 25 g to 30 g daily recommended by nutritionists. Even rich sources of fibre contain only about 6 g per serve. Thus eating the proverbial ‘apple a day’ is far from adequate; four or five servings or portions of high-fibre foods are advisable. Excellent sources of fibre include beans, dates, nuts, prunes, berry fruits, apples, oranges, pears, bananas, apricots, figs, bran cereals, corn ears, peas, spinach, potatoes, lentils, brussel sprouts, parsnips and wholegrain breads. Although it is uncertain whether fibre itself confers nutritional benefits, it clearly assists body functions related to cancer risk. In particular, fibre speeds the passage of food through the digestive system, influencing rates of nutrient absorption and of waste excretion. Such influences appear to benefit the bowel environment, apparently reducing the risk of cancer.
The vitamin A and C groups and minerals found in small quantities in many fibre-rich foods also seem to play an important role in cancer protection. Fruits and vegetables rich in these vitamins (as well as fibre) include broccoli, cantaloupe, carrots, cabbage, cauliflower, kohlrabi, turnips, spinach, squash, sweet potatoes, peaches, plums, tomatoes and watermelon.

Nutritionists consider the best way to obtain such micronutrients is within whole foods rather than separately in high dose tablets or liquid preparations. They argue that mega-doses of vitamins and minerals can create dietary imbalance and may even prove toxic when taken in excess.
To gain maximum nutritional value from fruits and vegetables, eat them fresh where possible; cook vegetables complete with skins; steam or bake fruits and vegetables, rather than boiling them; and reduce cooking time to the minimum.

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Why choose high-fibre foods?