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“Our study shows strong links between losing loved ones across the life course and faster biological aging in the U.S.,” said lead researcher Allison Aiello of Columbia University.

“We eagerly await the results of the other studies,” Jason Zucker, assistant professor of medicine at Columbia University Irving Medical Center, who was not involved in the trial, said in an email.

"There is a psychological threshold and you ask if it’s worth the risk,” said Monica Lypson, vice-dean for medical education at Columbia University.

"People are not taking the appropriate precautions," said Dr. Seth Feltheimer, internist and associate professor of medicine at Columbia University Vagelos College of Physicians and Surgeons.