Episode 370 - Post-Meal Walks and Type 1 Diabetes: What the Science Actually Says with Lauren Turner, MSc

If you’ve ever eaten a carb-heavy lunch and watched your glucose climb for the rest of the afternoon, this episode is for you. Rob sits down with Lauren Turner, a PhD candidate in Dr. Michael Riddell’s lab at York University in Toronto. She has lived with type 1 diabetes for seven years and has her name on 36 research publications on T1D and exercise. Her research on post-prandial walking started with a simple habit: 20-minute walks around the block after dinner with her dad and their dog. Lauren explains the science of why moving your body brings glucose down, even without extra insulin. She covers muscle acting as a “glucose sink,” why just three minutes of movement every 30 minutes can improve time in range by 14%, and why walking after a meal can cut post-meal spikes without causing lows. She also explains why that afternoon walk can still affect your numbers 24 to 48 hours later. Rob and Lauren also question some older advice. They talk about the outdated rule against exercising above 250 mg/dL and why the insulin on board shown on your pump is only an estimate. They share their personal thresholds for when to start moving, and a study finding that 10 to 30 minutes of activity gives an 83% chance of getting back in range in under an hour. Whether you’re a hybrid athlete or someone who finds 150 minutes a week overwhelming, you’ll come away with practical options: exercise snacks, stair climbing, the talk test for intensity, and a reminder that any movement counts. Resources: Lauren Turner’s thesis, The Timing of Walking and Post-Meal Blood Sugar Levels in Adults with Type 1 Diabetes (YorkSpace): https://yorkspace.library.yorku.ca/items/45a24ad2-b616-4d16-a1f8-c8cc7bbf79f3