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Summary
On episode 566 of 40+ Fitness, Coach Allan sits down with Catherine de Lange, head of features at New Scientist magazine, where she covers neuroscience, health, and genetics.
Catherine explains metabolic flexibility, the body’s ability to switch between burning fat and burning carbohydrate for fuel, and why it is a strong predictor of metabolic syndrome risk. She walks through the research behind building that flexibility, including a study that made healthy women metabolically inflexible after just two months of bed rest.
The conversation covers tools like the Lumen breath device and continuous glucose monitors, and a simple, low effort strategy: eating fiber and protein before carbohydrates at a meal to blunt the blood sugar spike that follows.
Links
- https://www.newscientist.com
Key Takeaways
- Metabolic flexibility predicts metabolic health. The ability to switch smoothly between burning carbs and burning fat is linked to your risk of developing the high blood pressure, high cholesterol, and obesity that make up metabolic syndrome.
- Inactivity breaks metabolic flexibility fast. A researcher put healthy, fit women on two months of bed rest with no physical activity, and they became metabolically inflexible. A separate five-year study found that inflexible people were more likely to develop obesity and blood glucose problems.
- Regular exercise is the most reliable way to build flexibility. You do not need an extreme diet to train this ability. Consistent exercise trains the body to switch fuel sources on demand.
- Eating earlier in the evening supports overnight fat burning. A longer overnight fasting window, especially with fewer carbs at dinner, gives the body a clear stretch to burn through stored carbs and shift into burning fat while asleep.
- The same food can trigger very different blood sugar responses in different people. Even identical twins can eat the same banana and see very different glucose spikes, which undercuts the idea that a food’s glycemic index applies the same way to everyone.
- Tools like Lumen and continuous glucose monitors give a real window into your own metabolism. Lumen measures the carbon dioxide to oxygen ratio in your breath to estimate whether you are burning fat or carbs in that moment, while a glucose monitor shows how specific foods and habits actually affect your blood sugar.
- Eating order changes your blood sugar response. Eating fiber first, then protein, then carbohydrate slows digestion and blunts the glucose spike compared to eating the same foods in a different order, or eating dessert as a late snack instead of with the meal.
- Catherine’s three strategies to get and stay well: exercise in whatever form fits your life, spend time in nature (ideally combining the two by exercising outdoors), and get direct sunlight early in the day for energy, mood, and better sleep.
“Everybody’s body is responding very differently to food and exercise.”
Catherine de Lange
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