Soy for women, fish for men
[ 2007-04-24 09:06 ]
Soy food good for
Women who ate soy regularly as children have a lower risk of breast
cancer, American researchers report. And men who eat fish several times a
week have a lower risk of colon cancer, a second team of researchers have
told the American Association for Cancer Research.
The studies add to a growing body of evidence about the role of diet in
cancer. Cancer experts now believe that up to two-thirds of all cancers
come from lifestyle factors such as smoking, diet and lack of exercise.
The US National Cancer Institute and researchers at the University of
Hawaii found that women who ate the most soy-based foods, such as tofu and
miso, when aged 5 to 11, reduced their risk of developing breast cancer by
58 per cent. It was not clear how soy might prevent cancer, though
compounds in soy called isoflavones have estrogen-like effects.
A second study showed that men who ate fish at least five times a week
had a 40 per cent lower risk of developing colorectal cancer compared with
men who ate fish less than once a week.
Many kinds of fish are rich in omega-3 fatty acids, which interfere
with the cyclooxygenase-2 or COX-2 enzyme. COX-2 affects inflammation,
which may play a role in tumour