How to live longer (w/ Keith Diaz)

“Movement had become an inconvenience for my daughter too,” says exercise scientist Keith Diaz, recalling how his preteen complained about a twenty-second longer walk to the library. That moment captures the central problem Diaz studies at Columbia University: our world has been engineered to keep us sitting, starting in kindergarten, and that sedentary default is quietly driving up our risk for dementia, diabetes, hypertension, cancer, and heart disease. But his research offers a surprisingly low-bar solution: you don’t need a gym membership or a marathon training plan. You just need to move briefly and regularly throughout the day.

The case for movement breaks, not just exercise

Diaz’s lab studies are intense—volunteers sit for nine hours straight, fitted with continuous glucose monitors and IVs, while researchers measure blood sugar, blood pressure, and cognitive performance. The key finding: taking a one- to five-minute walking break every half hour to hour offsets most of the harms of prolonged sitting. And the walking pace was deliberately slow—just two miles an hour, slower than most people’s natural stride. Yet the results were dramatic: blood sugar dropped by 60 percent, comparable to what you’d see from medication, and blood pressure improved by four to five points, about the same reduction you’d expect from six months of regular aerobic exercise.