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Editor's Note: This Upshot article includes a table of the "Largest N.I.H. grant recipients among colleges, universities, and medical schools." Columbia University Health Sciences appears as #7.

For decades, nutrition researchers have focused on what — not when — people eat, so we don’t have many large or long-term studies on the influence of meal timing on health, said Nour Makarem.

“They are very uncertain as to how to proceed at the moment,” said Dr. Robert Klitzman, a psychiatrist and professor who was a founder of Columbia University’s Center for Bioethics.