March 20 (Bloomberg) -- Aramark Corp., which runs concession stands at 13 Major League Baseball stadiums, has eliminated trans fats in cooking oils it uses and added new food choices, such as sushi and meatball subs, at some parks.

Aramark will use corn and sunflower oils that don't contain trans fats in its concession kitchens at fields including New York's Shea Stadium and Boston's Fenway Park, the Philadelphia- based company said in a statement. Foods cooked with the new oils will have less than a half-gram of trans fat per serving, closely held Aramark said.

Trans fats extend the shelf life of oils and other cooking fats and can contribute to heart disease. Aramark also is working with suppliers to cut the additive from the food products it buys, spokesman Dave Freireich said.

``We're working with our distributors to make the conversion,'' he said. ``The menus will remain the same.''

The change takes effect from the start of this year's Major League Baseball season on April 1. Fans will see new choices at some stadiums, including sushi or hot roast beef at Fenway, chipotle chicken pizza or vegetarian steaks at Citizens Bank Park in Philadelphia and meatball submarine sandwiches at Oriole Park at Camden Yards in Baltimore.

Aramark has added healthy options, including salads, grilled chicken and vegetarian hot dogs and hamburgers, to its menus in recent years.

A number of food-service companies, including McDonalds Corp., Yum! Brands Inc. and Starbucks Corp., have eliminated trans fats, while cities such as New York and Philadelphia have enacted bans. Several other cities including Boston, Chicago and Los Angeles also are considering similar proposals.

To contact the reporter on this story: Courtney Dentch in New York at cdentch1@bloomberg.net.

Last Updated: March 20, 2007 13:30 EDT