They were running up their sugar levels.

Around 100 sweet-toothed sprinters filled the streets of Manhattan and Brooklyn for a half-marathon that stopped at nearly a dozen local bakeries on Sunday.

NYC Bakery Run runners stuffed their faces with cream-filled croissants as they sweat through the 13.1-mile course totally loaded up on carbs from eight local bakeries along the route. 3

The race began in Bushwick at 9 a.m., across the Williamsburg Bridge into Manhattan — and then across the Manhattan Bridge and into Brooklyn Heights.

Runners stopped to nosh on pastries and sandwiches from places like Raf’s bakery, Cupcakes from La Bicyclette, and savory-stuffed hand pies from L’Appartement 4F.

Workers at the bakery destinations held out sheets of luxe-looking croissants and impeccable

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