Is Food Really the Main Variable in Blood Sugar?

Why does the same food spike one person’s blood sugar and barely move another’s? In this episode of The Habit Healers Podcast, I break down the science of personalized nutrition and why your blood sugar response is far more individual than any diet chart can predict.For most of my career I told patients to build meals around whole foods, and that foundation still holds. But then I read a study that gave 800 people continuous glucose monitors and tracked more than 46,000 meals, and it broke apart an assumption most doctors share: that the food alone determines your blood sugar. It turns out counting carbs is a surprisingly weak predictor. Your gut microbiome, your sleep, your insulin sensitivity, and even what you ate at your last meal all shape what happens next. It’s why one person spikes on a banana but not a cookie, and why that afternoon energy crash you keep blaming on lunch might actually start with breakfast. This is bio-individuality, and understanding yours is one of the most practical steps you can take for your metabolic health.In this episode, you’ll learn:* Why the same food produces wildly different blood sugar responses in different people* How gut bacteria, sleep, and insulin sensitivity drive your glucose response* Why “available carbohydrates” matter more than total carbs* How whole, plant-forward foods keep blood sugar steadier for nearly everyone* A simple no-monitor habit to learn your own metabolic pattern this weekDr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/is-food-really-the-main-variableCheck out the Habit Healers Community: https://www.skool.com/habithealers/about Get full access to The Habit Healers at drlauriemarbas.substack.com/subscribe