What Red Bull Does to Your Blood Sugar (CGM Test)

Ever wondered how Red Bull affects your blood sugar? I tested it with my CGM and the results were intense. A single can packs 27 grams of sugar and 80 mg of caffeine. My blood glucose jumped from 5.7 to 8.4 mmol/L — a sharp 47% spike — within 40 minutes, and the impact lasted almost an hour. That’s a big hit for such a small can. This shows how energy drinks deliver a fast and heavy glucose load, especially when mixed with caffeine. My advice? If you need energy, go for water, sleep, or electrolytes instead.

Metabolic Health Insights 🔬

Red Bull is a textbook example of how sugar and caffeine can rapidly disrupt glucose stability. The high glycemic load causes a swift spike in postprandial glucose, while caffeine may impair insulin sensitivity in some individuals, compounding the metabolic impact. For anyone dealing with insulin resistance or looking to improve metabolic flexibility, energy drinks like these should be occasional treats at best. Regular consumption increases the risk of insulin resistance, energy crashes, and long-term metabolic dysfunction. CGM testing is a powerful way to visualize how these drinks hijack your blood sugar response.