BOSTON -- Jonah Pesner is looking ahead to his crucial carb-loading, fuel-up meal on the night before running his first Boston Marathon. On the menu: matzoh.

It's not the usual choice for marathoners loading up on carbohydrates to drive their run, but Pesner, a rabbi, has limited options.

Passover begins just two days before the April 21 marathon, and the holiday's strict dietary rules mean Jewish runners can't eat bread and pasta, the normal staples in the days before the big race.

Besides matzoh, which is unleavened bread, Pesner plans to pound down foods such as potatoes during a rare "carb-load seder" the night before the race.

Pesner never considered breaking the dietary rules for the sake of the race, which he is running with his wife for an autism charity.

"For me, running the marathon is a very spiritual quest," he said.

The marathon is always held on Patriots Day, a state holiday that falls the third Monday in April, and often comes within the weeklong Passover holiday.