An apple a day might keep the doctor away, but Rob Merlino is going to leave that for another month.
Without regard for his fat or salt intake, the 47-year-old father of five from Natick is celebrating National Hot Dog Month by chowing down one frank a day, every day, throughout July.
In a seemingly unquenchable quest for the iconic utensil-free food, he’s been touring grills, shacks, trucks, trailers, streetside carts, and box-car diners throughout the region, choosing between grilled, steamed, fried, and boiled hot dogs for what he is planning to be 31 lunches in a row.
“Everybody’s making a big deal out of it, ‘Oh my gosh, that’s a lot of hot dogs,’ ’’ said Merlino, who shifted from mortgages to mustard about a decade ago, and operated his own hot dog truck for six years. “But the guy who won the Nathan’s contest ate twice as much as I’ll eat in a month, in about 15 minutes,’’ he noted, referring to champion chowhound Joey Chestnut. (Earlier this month, Chestnut consumed 62 hot dogs in 10 minutes to win the Nathan’s Famous Fourth of July International Hot Dog Eating Contest at Coney Island in New York for the fifth year in a row, according to the company’s website.)

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