Croissants for Breakfast: A CGM Blood Sugar Experiment

Curious how a classic pastry breakfast affects blood sugar? I tested two medium-sized croissants using my CGM to find out. My glucose jumped from 5.2 to 8.3 mmol/L — a sharp 60% spike. I’d hoped that adding ham, cream cheese, and veggies would blunt the effect, but it didn’t. This showed me that even pairing croissants with protein and fiber couldn’t fully offset the carb load. My takeaway? For better glucose control, start with a savory omelet and veggies, then enjoy half a croissant for dessert instead of diving straight into the carbs.

Metabolic Health Insights 🔬

This experiment highlights how processed, refined carbs like croissants can rapidly raise postprandial glucose levels — even when combined with fat and protein. These spikes challenge metabolic stability and can worsen insulin resistance over time. For those working on metabolic flexibility or aiming to prevent type 2 diabetes, it’s critical to be strategic with carbohydrate timing and composition. Using a CGM reveals how your body uniquely reacts, helping tailor a breakfast that supports balanced energy, hormone health, and gut function. Starting with low-glycemic foods can dramatically improve your glucose response.