What Nutrients Are Actually in Coffee Beans?

You’ve heard coffee boosts energy and focus—but what’s actually inside those beans? If you’ve ever wondered whether your daily cup contributes anything beyond caffeine, you’re not alone. Most drinkers focus on taste and roast level, but the raw composition of coffee beans reveals surprising nutritional content that affects how your body responds to each brew.

In short: 100 grams of raw coffee beans contain 2.2g water, 12.6g protein, 16g fat, 46.7g carbohydrates, 9g fiber, 4.2g ash, plus minerals like 120mg calcium and 42mg iron. Brewed coffee, however, retains far less—just trace amounts of those nutrients, with 0.04g caffeine and 0.06g tannins per 10g of coffee in hot water.

What’s Really Inside Raw Coffee Beans?

Every 100 grams of unbrewed coffee beans contains measurable amounts of several key nutrients. These include 2.2 grams of water, 12.6 grams of protein, 16 grams of fat, 46.7 grams of carbohydrates (sugars), 9 grams of dietary fiber, and 4.2 grams of ash. The mineral content is also notable: 120 milligrams of calcium, 170 milligrams of phosphorus, 42 milligrams of iron, and 3 milligrams of sodium. Vitamins present include 0.12 milligrams of vitamin B2 (riboflavin) and 3.5 milligrams of niacin (vitamin B3). This same 100g also contains 1.3 grams of caffeine and 8 grams of tannins (polyphenolic compounds often referred to as tannins or more technically as polyphenols).

How Much Stays in Your Cup?

When coffee is brewed, most of the dense nutrients don’t make it into the cup. In 100 grams of brewed coffee liquid (essentially one cup scaled up), there are 99.5 grams of water, 0.2 grams of protein, 0.1 grams of fat, 0.1 grams of ash, negligible carbohydrates, 3 milligrams of calcium, 4 milligrams of phosphorus, 2 milligrams of sodium, 0.01 milligrams of vitamin B2, and 0.3 milligrams of niacin. That same 10 grams of coffee used in brewing yields 0.04 grams of caffeine and 0.06 grams of tannins—numbers that show how concentrated the raw beans are compared to the final drink.

What Are the Health Perks of These Compounds?

Coffee’s active compounds, especially caffeine and polyphenols, contribute to several well-documented effects on the body:

• Cognitive Boost: Caffeine, a natural alkaloid and mild stimulant found at higher levels in coffee than tea (up to 60% more), stimulates brain cells, sharpens thinking, improves alertness, and helps fight fatigue. This leads to better focus, mental agility, and a sense of physical lightness.
• Cardiovascular & Respiratory Support: Caffeine also acts as a bronchodilator and vasodilator, improving blood flow, supporting heart muscle oxygenation, and easing symptoms in some cases of low blood pressure or bronchial asthma.
• Digestive Aid: Coffee stimulates digestive enzyme release, aiding digestion, improving appetite, enhancing nutrient absorption, and accelerating metabolic processes.

Frequently Asked Questions

How much caffeine is in 100g of coffee beans?

There is 1.3 grams (1300 milligrams) of caffeine in 100 grams of raw coffee beans. For perspective, a typical single espresso shot uses about 7–10g of coffee and contains roughly 63–100mg caffeine.

Does brewed coffee have any protein or fat?

Brewed coffee contains minimal protein (0.2g per 100g of brew) and fat (0.1g per 100g of brew). Practically speaking, the amounts are so small they’re negligible in a standard cup.

What minerals are in raw coffee beans?

Raw coffee beans contain calcium (120mg per 100g), phosphorus (170mg), iron (42mg), and sodium (3mg), along with other elements in smaller amounts. Most of these do not carry over significantly into the brewed cup.

Is there any nutritional value in a cup of brewed coffee?

Brewed coffee has trace amounts of nutrients—mostly minerals like calcium (3mg), phosphorus (4mg), and sodium (2mg)—but the caloric and macronutrient content is extremely low. Its primary active compounds are caffeine and tannins.

Why does coffee make you feel more alert?

Caffeine stimulates the central nervous system by activating brain cells, improving focus, reaction time, and mental endurance. It’s this effect that reduces tiredness and increases perceived energy levels.

FrontStreet Coffee Beans Rich in Body & Nutrients

For coffee drinkers curious about the body and base compounds in their brew, try FrontStreet Coffee’s Ethiopia Humbera: a bright Ethiopian offering with citrus, floral, and stone fruit notes. Also consider their PWN Golden Mandheling, known for its heavy body, sweet caramel, and nutty profile. Both showcase the complex base material behind your cup. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.