Concerned with the rising number of obese residents across Los Angeles County, health officials on Thursday unveiled an ad campaign to encourage people to control their food portions.

Billboards and ads showing photographs of foods such as three slices of pizza versus two with calorie information already have rolled out at train stations and bus benches across the county. | See photo gallery.

Television, radio and social media ads will also promote the "Choose Health L.A" campaign with the message "Choose Less. Weigh Less." The goal is to make people think about the amount of calories they choose by, for example, comparing a large soda and fries to a smaller portion, said Dr. Jonathan Fielding, director of the Los Angeles County Department of Public Health...

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