Some Olympic athletes could be at risk while training and competing because of heart defects or dysfunction that they may not even know about,

 Reducing the portion sizes offered in supermarkets, restaurants and at home would help reverse the obesity epidemic, say researchers.

 Newborn babies of overweight or obese mothers have a thickening of the aorta, something that in later life is linked to heart disease, a small Australian study said.

 Air pollution in Tehran has left 4,460 people dead in a year, an Iranian health official said in reports Sunday, with another sounding the alarm over high dose of carcinogens in domestically-made petrol.