Kyle Diamantas is a lawyer, not a doctor, who will oversee products making up a quarter of the U.S. economy If you’ve ever swallowed an aspirin, put milk in your coffee, fed your pet, or filled a prescription, then you’ve relied on the lifesaving oversight of the U.S. Food and Drug Administration. Long viewed as the world’s gold standard in regulating food and medicine, the FDA is a behemoth that oversees products comprising roughly one quarter of the U.S. economy.   Even on the best of days, the FDA commissioner — a Senate-confirmed position — must wander a pitiless wilderness of excruciating judgement calls, whether the record-speed approval of Covid-19 vaccines or the minefield of mail-order birth control pills, all while fending off powerful companies expecting VIP treatment.   Doing the job well, or even at all, is not a friend-building exercise.    After days of being dangled like a cat toy between warring parties in the White House and the Department of Health and…