A new study is offering yet more proof that eating fish can reduce the risk of heart disease.

In it, researchers found that Japanese men, who ate a diet full of tuna, sardines and salmon had twice the levels of omega-3 fatty acids compared to North American men.

That significantly reduced their risk of the artery-clogging disease atherosclerosis, according to the study, which was published in the Journal of the American College of Cardiology.

One cardiologist says this study will change the way he counsels his patients.

"I will tell them that besides treating their primary risk factors such as hypertension, diabetes, or high cholesterol, I would encourage them to eat more fish. said Cardiologist Dr Carlos Leche.

"Because this will-by itself-have a preventive effect on the development of atherosclerosis," said Leche said.

Japanese people eat about three ounces of fish daily. A typical North American eats fish twice a week.

Meanwhile, a new study suggests drinking sugary pop and fruit juices increases your risk of type-two diabetes.

Researchers did a 10-year follow up of nearly three thousand women who developed the disease.

They found those who drank two or more cans of pop in a day had a 24 per cent increase in diabetes risk compared to those who drank less than one a month.

Those who drank two or more fruit drinks a day had a 31 per cent increase in their risk.

And finally, a new report suggests that people need to exercise more in order to avoid gaining weight.

The report challenges the theory that 30 minutes of moderate physical activity is the prescription for losing and maintaining a healthy weight.

A growing consensus among doctors suggests even more exercise is needed to keep off the extra pounds over the long term.

According to the report, overweight and obese women should exercise 55 minutes a day, five days a week. That resulted in weight loss of 10 percent over two years.

Results from both of these studies have been published in the Journal of American Medical Association Archives.

With a report by CTV British Columbia's Dr. Rhonda Low.