BUDAPEST, Hungary - Eastern European nations, including Hungary, Bulgaria, Poland and the Czech Republic, are the worst in the world for serving unhealthy meals in fast-food outlets.

Health expert Steen Stender, a Danish professor from a university research group, tells the 15th European Congress on Obesity that Eastern European countries must cut the use of trans fat -- the "silent killer'' -- from fast food.

According to a global survey by Stender, Hungary, Bulgaria, the Czech Republic and Poland serve foods at outlets with the highest levels of trans fat.

He suggests a switch from trans fat to the less harmful saturated fat at franchise giants such as McDonald's and Kentucky Fried Chicken.

Hungary is among the worst fast-food serving countries.

Stender says he feels pity because Hungary already has a high death toll when it comes to heart disease.