In moderate amounts (3–4 cups a day), studies show coffee has positive effects: lower risk of type 2 diabetes, Parkinson's, and liver diseases. Negative effects like sleep disturbances mostly occur with higher consumption.

Is coffee healthy or unhealthy?

In moderate amounts (3–4 cups a day), studies show coffee has positive effects: lower risk of type 2 diabetes, Parkinson’s, and liver diseases. Negative effects like sleep disturbances mostly occur with higher consumption.

Why that is

Coffee is one of the most thoroughly studied foods in the world. Thousands of studies paint a surprisingly consistent picture—and it’s more positive than many people think.

What the research shows:

• Type 2 Diabetes: Multiple meta-analyses show a 25–30% lower risk with 3–4 cups per day. The effect also occurs with decaffeinated coffee—so caffeine isn’t solely responsible.
• Parkinson’s: Regular coffee consumption lowers the risk by about 25–30%. Caffeine seems to play the crucial role here.
• Liver diseases: Coffee protects the liver—this applies to fatty liver, cirrhosis, and liver cancer. Even 2 cups a day show positive effects.
• Antioxidants: In Western diets, coffee is one of the largest sources of antioxidants—even ahead of fruits and vegetables.

Potential negative effects:

• Sleep disturbances when consumed in the afternoon or evening.
• Jitters and rapid heartbeat in sensitive individuals or with excessive consumption.
• Stomach problems for those with a sensitive stomach, especially on an empty stomach.
• Blood pressure spike in the short term, but decreasing with regular consumption.
• Dependency: Caffeine creates tolerance—quitting suddenly can cause withdrawal headaches.

Important to note: Most studies look at black coffee. A Frappuccino with 400 kcal from sugar and whipped cream has different health implications than a black filter coffee.

In practice at Green Wall Coffee

At Sophienstraße 27, we drink coffee all day ourselves—but black and in moderation. My recommendation: 3–4 cups a day, the last one before 2 PM, and preferably without sugar. That way, you get the best of both worlds.

Related questions

• How many cups of coffee a day are safe?
• Does coffee harm the stomach?
• Is coffee bad for blood pressure?

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