SAN ANTONIO (AP) — Smile, schoolchildren. You're on calorie camera.

Health officials trying to reduce obesity and improve eating habits at five San Antonio elementary schools unveiled a $2 million research project Wednesday that will photograph students' lunch trays before they sit down to eat and later take a snapshot of the leftovers.

A computer program then analyzes the photos to identify every piece of food on the plate — right down to how many ounces are left in that lump of mashed potatoes — and calculates the number of calories each student scarfed down.

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