Filter coffee mixed with butter and MCT oil, often part of a ketogenic diet. It's supposed to keep you full and boost concentration. Not scientifically proven, up to 500 kcal per cup, and the butter heavily masks the coffee's flavors.

What is Bulletproof Coffee and is it healthy?

Filter coffee mixed with butter and MCT oil, often part of a ketogenic diet. It’s supposed to keep you full and boost concentration. Not scientifically proven, up to 500 kcal per cup, and the butter heavily masks the coffee’s flavors.

Why that is

Bulletproof coffee was popularized by Dave Asprey—he blended high-quality filter coffee with grass-fed butter (like Kerrygold) and MCT oil (medium-chain triglycerides from coconut oil) into a creamy, latte-like drink. The idea: the fat slows down caffeine absorption, keeps you full for a long time, and provides energy for the morning—without an insulin spike.

The pros:

• Satiety. 30–50 g of fat per cup actually keeps you full. For those with no appetite in the morning, it bridges the gap until lunch.
• Ketogenic diet. For people in ketosis, the fat provides direct energy without affecting insulin levels.
• Caffeine effect. Some report a smoother, longer-lasting caffeine effect—presumably because the fat delays stomach emptying.

The cons:

• No scientific evidence. The claimed cognitive benefits (better focus, more clarity) are not proven in controlled studies.
• Extremely high calories. 400–500 kcal per cup, mostly from saturated fats. For those not eating keto, this is a significant calorie surplus.
• Saturated fats. The DGE (German Nutrition Society) recommends limiting saturated fats. A single cup of bulletproof coffee contains more than the recommended daily limit.
• Flavor. Butter and oil completely overpower the coffee’s aromas. For specialty coffee lovers, it’s a loss—you taste butter, not coffee.
• Not a breakfast replacement. Fat alone provides no vitamins, minerals, or fiber.

From a coffee perspective: If you appreciate good coffee, making bulletproof coffee wastes the bean’s flavors. Butter and MCT oil mask everything—whether it’s an Ethiopian single origin or a supermarket blend makes no difference.

In practice at Green Wall Coffee

At Sophienstraße 27, we don’t serve bulletproof coffee. Our recommendation: drink your coffee black or with a little milk and enjoy the flavors. If you’re looking for a filling breakfast alternative, you’re better off with porridge and a good filter coffee.

Related questions

• What distinguishes espresso from regular coffee?
• What is the difference between cappuccino, latte macchiato, and flat white?
• What is Dalgona coffee?

Stop by Sophienstraße 27 — Mon–Fri 8am–5pm, Sat 10am–5pm.