A suggestion from the Cancer Society that regulating ads children are exposed to could help prevent cancer.

It's funded an Otago University study that's found children see ads relating to gambling seven times, alcohol 4.5 times and junk food 27 times every day.

Cancer Society medical director, Kate Gregory, says children are vulnerable to messages, which increases consumption of these products.

She told Roman Travers around 50 percent of cancers are caused by things like being overweight and high alcohol consumption.

She says cancer can be prevented if we're able to reduce the amount of advertising for these kind of products children are exposed to.

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