At 67 years old, Dr. Nir Barzilai looks about the same as, if not younger than, he did 10 years ago. It’s apparent in side-by-side photographs, and it’s what most people who know him say. Barzilai lives a healthy lifestyle. He exercises every day, eats right, and practices intermittent fasting.
He’s also been taking the diabetes drug metformin off label for 10 years. He has never been diagnosed with diabetes or prediabetes—the conditions for which the drug is approved and prescribed—but takes it for a different off-label reason.
