After dividing the women into five groups (quintiles) according to their fibre intakes, the researchers calculated that an average daily intake of 30 grams or more of total fibre was associated with a 52 per cent lower risk of breast cancer in pre-menopausal women, compared to pre-menopausal women with a daily intake of 20 grams or less.

The average person in the UK is reported to eat about 12 grams a day.

Strong relationships were also observed for cereal and fruit fibre intakes. The upper quintile of cereal fibre intake (13 or more grams per day) was associated with a 41 per cent breast cancer risk reduction, compared to the lowest quintile intake (four or less grams), while 6 or more grams per day of fruit fibre was associated with a 29 per cent breast cancer risk reduction, compared to two or less grams per day.

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