BOSTON (AP) — Boston has joined a growing number of U.S. cities, including New York and Philadelphia, in banning artery-clogging trans fats from food that's made in restaurants and grocery stores.

Businesses, as well as schools and hospitals, will have to stop using oils and spreads that contain trans fats. Prepackaged foods such as a bag of chips or cookies won't be included.

The city Public Health Commission approved the ban unanimously Thursday. Fines would be up to $1,000 per violation.