A new study shows that exposure to two specific 'forever chemicals' may accelerate biological aging, especially in middle-aged men. Researchers revealed a link between faster epigenetic aging, and two of these alternatives, PFNA and PFOSA, a precursor of PFOA.

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The 10% leeway is being built in to reflect that some patients may not be able to make a same-day appointment or may call too late in the day to be realistically given one.

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