Wissenschaftler studierten die Ernährungsgewohnheiten von
rund 500.000 Menschen in 10 Ländern. Dabei zeigte sich, dass
eine an Ballaststoffen reiche Nahrung das Risiko für Darmkrebs
um bis zu 40% senken kann. Eine von einem US-Team durchgeführte
zweite Studie kam zu ähnlichen Ergebnissen.
Wenn sich diese Funde bei weiteren Studien bewahrheiten, eröffnet
dies ganz neue Möglichkeiten für die Krebsverhütung.
Doch bereits jetzt kommen erste Zweifel auf: eine dritte, im renommierten
International Journal of Epidemiology veröffentlichte Studie
konnte im Gegensatz zu den anderen beiden Studien bei ballastreicher
Ernährung keinen Vorteil finden.
fibre intake almost halves the risk of developing bowel cancer,
The conclusion comes from the biggest study ever undertaken into
European eating habits. Similar findings have been produced in
a separate new study by a US team.
However, a third new study - also by US researchers - found little
evidence that fibre offers a protective effect.
The European study was funded by a consortium including Cancer
Research UK, the Medical Research Council (MRC) and the European
Scientists studied the diets of more than 500,000 people in 10
European countries. They found people who ate the most fibre rich
food had the lowest incidence of bowel cancer, while those with
least fibre in their diets had the most cases of the disease.
A fibre rich diet was defined as 35g a day. That equates to seven
portions of fruit and vegetables per day plus five slices of wholemeal
bread. Fibre is found in high quantity in cereals, vegetables
and fruit. The research did not examine the effect of fibre supplements
or foods with added fibre. Lead researcher Professor Nick Day
said: "Our report suggests that if people with a low level
of fibre in their diet were to double their intake that the risk
of bowel cancer could be reduced by 40%.
is a good source of fibre
Dr Elio Riboli, of the International Agency for Research on Cancer,
coordinated the study. He said: "By studying so many different
populations with different diets we were able to get a much more
accurate picture of how different kinds of foods contributing
fibre to our usual diet relate to the incidence of bowel cancer."
The research found that cereals were the main source of fibre
in Netherlands, Germany, Sweden and Denmark.
Vegetables were the main source of fibre in France and the UK,
while it was fruit in Italy and Spain. US researchers from the
National Cancer Institute, Rockville, found that people who ate
a high fibre diet were less likely to develop colorectal polyps,
which can lead to bowel cancer.
However, a separate team from National Cancer Institute, who examined
45,000 women over three decades, failed to produce similar evidence.
The European team has suggested that studies which do not show
a protective effect from eating fibre may be sampling people whose
fibre intake is not sufficiently high to produce a positive effect.
Bowel cancer is the second highest cause of cancer death in the
UK responsible for 16,170 deaths each year.
Both studies suggesting a positive effect are published in The
Lancet. The negative study is published in the International Journal