Nutrition Facts for Dark Chocolate 2026

A standard 100-gram bar of 70% dark chocolate contains 604 calories, 43 grams of fat, and 46 grams of carbohydrates—but that same bar also packs 12 grams of fiber and 67% of your daily copper needs. Most people don’t realize they’re eating something closer to a supplement than a dessert.

Last verified: April 2026

Executive Summary

Nutrient	Per 100g (70% Dark Chocolate)	% Daily Value	Notes
Calories	604 kcal	30%	High energy density; typical serving is 30-50g
Total Fat	43g	66%	Mostly monounsaturated and saturated; minimal trans fat
Dietary Fiber	12g	48%	Significantly higher than milk chocolate (2g per 100g)
Iron	7.3mg	41%	Non-heme iron; absorption enhanced by vitamin C
Magnesium	228mg	57%	Exceeds many magnesium supplements in single serving
Copper	1.6mg	67%	Critical for bone health and metabolism
Total Phenolic Compounds	540-1100mg	Variable	Range depends on cacao percentage and processing method

What’s Actually Inside Dark Chocolate: The Real Story

Here’s what gets ignored in most nutrition discussions: dark chocolate is fundamentally different from other foods because it contains compounds that actively work in your body. When you eat a piece of 70% dark chocolate, you’re consuming polyphenols, flavonoids, and theobromine simultaneously. The polyphenol count alone—typically 540mg to 1,100mg per 100 grams depending on cacao sourcing and fermentation—exceeds what you’d find in a serving of berries or red wine.

The fat profile matters here. Yes, 100 grams contains 43 grams of fat. But 61% of that is actually stearic acid and oleic acid, both monounsaturated or relatively neutral fats that don’t spike triglycerides the way you’d expect. Cocoa butter also contains palmitic acid (about 25% of the fat), which research from Harvard shows has minimal impact on LDL cholesterol when paired with fiber—and dark chocolate delivers 12 grams of fiber per 100 grams, dramatically changing how your body processes it.

That said, the data here is messier than I’d like. Cacao fermentation, roasting temperature, and varietal all shift the nutritional profile. A single-origin 70% bar from Ecuador might have 687mg of polyphenols, while a different 70% bar from West Africa tops out at 482mg. This isn’t standardized. Most manufacturers don’t disclose these details because they vary batch to batch. The numbers in this guide use research-grade samples from peer-reviewed studies—real-world bars you buy might land 15-20% higher or lower.

Magnesium content is the real story nobody talks about. A 50-gram serving (about one standard square a day) delivers 114mg of magnesium—that’s 28% of the recommended daily intake. For comparison, a cup of cooked spinach gives you 157mg. But here’s the key difference: dark chocolate’s magnesium absorption rate sits higher because cocoa also contains compounds that improve mineral bioavailability. Essentially, your body uses the magnesium in dark chocolate more efficiently than it would from a synthetic supplement.

Dark Chocolate vs. Other Chocolate Types: The Numbers

Chocolate Type	Calories (per 100g)	Fiber (g)	Sugar (g)	Polyphenols (mg)	Magnesium (mg)
70% Dark Chocolate	604	12	24	540-1100	228
85% Dark Chocolate	598	16	12	780-1450	271
50% Dark Chocolate	620	8	44	300-600	165
Milk Chocolate	645	2	56	80-200	70
White Chocolate	642	0	62	0	12

The jump from 70% to 85% dark chocolate tells you something important: you’re not just removing sugar, you’re dramatically increasing the bioactive compounds. An 85% bar contains roughly 40% more polyphenols with half the sugar. Most people assume all chocolate beyond 70% tastes unbearable, but that’s behavioral, not nutritional. The magnesium content also climbs 19% from 70% to 85%—moving from 228mg to 271mg per 100 grams.

Milk chocolate sits as the middle ground that’s actually worse on both axes. It has more calories than 70% dark chocolate (645 vs. 604), nearly triple the sugar (56g vs. 24g), and roughly one-third the magnesium (70mg vs. 228mg). You’re getting minimal polyphenol benefit while consuming significantly more sugar. The trade-off doesn’t work mathematically. White chocolate, for the record, has zero polyphenols—cocoa solids are completely absent, leaving only cocoa butter, milk, and sugar.

Key Factors That Change Dark Chocolate’s Nutrition

Cacao Percentage and Processing Method
The number on the package—70%, 85%, 90%—tells you the proportion of cacao solids and cocoa butter relative to added sugar and other ingredients. But it doesn’t tell you about fermentation. Studies show that fermented cacao has 25-30% more polyphenols than unfermented cacao because fermentation breaks down cell walls and makes compounds more bioavailable. Dutch-processed (alkalized) dark chocolate loses approximately 60% of its polyphenols compared to natural cocoa powder. Most commercial dark chocolate undergoes some alkalization for smoother flavor, which means you’re getting fewer polyphenols than the “full potential” of the cacao. If polyphenol content matters to you, buy bars that specifically state “natural cocoa” or “non-alkalized.”

Storage Temperature and Age
Dark chocolate stored above 21°C (70°F) begins losing polyphenol stability after 6 months. Research from the University of Illinois found that chocolate stored at room temperature for a year lost 14% of its flavonoid content. Temperature fluctuations—like moving from a warm car to a cold office—accelerate this degradation. Your pantry’s average temperature matters more than most people realize. Additionally, older chocolate often has fat bloom (white streaking), which is just cocoa butter crystallizing on the surface—it doesn’t degrade nutritional content, just appearance.

Origin and Terroir
Cacao from Madagascar contains roughly 60% more polyphenols than cacao from Indonesia, according to a 2024 analysis across 40 chocolate brands. The soil composition, altitude, and climate where cacao grows directly influence the plant’s polyphenol production. Single-origin bars—typically labeled with a specific region like “Ghana,” “Ecuador,” or “Madagascar”—show this variation clearly. You’ll pay $4-$8 USD per bar for single-origin versus $2-$3 USD for blended varieties, but the polyphenol content justifies the difference if you care about the bioactive compounds.

Added Ingredients and Sugar Type
Dark chocolate with added ingredients—coconut oil, soy lecithin, vanilla—doesn’t meaningfully change core nutrients, but sugar type does. Bars sweetened with cane sugar vs. coconut sugar show identical calorie content, but coconut sugar has a lower glycemic index (35 vs. 68 for cane sugar). This means your blood sugar rises more gradually. Some premium bars use monk fruit or stevia as sweeteners, reducing sugar to 8-12 grams per 100 grams while maintaining similar calorie counts. The price difference is usually $1-$2 USD per bar, making it worthwhile if blood sugar management is a priority.

Expert Tips: How to Get the Most From Dark Chocolate

Pair with Vitamin C Sources
Iron absorption from dark chocolate improves 3-4 times when consumed with vitamin C-rich foods. A 50-gram serving of dark chocolate (which contains 3.65mg of iron, the type the body absorbs less efficiently) becomes significantly more bioavailable when eaten with an orange, strawberries, or a glass of orange juice. This combination is the difference between using dark chocolate as just a calorie source versus actually absorbing its minerals.

Eat 30-50 Grams Daily, Not All at Once
Studies on chocolate’s cardiovascular benefits used daily doses of 30-50 grams spread throughout the day, not 100-gram binges. A 30-gram serving delivers 180 calories, 6 grams of fiber, and approximately 270-330mg of polyphenols. Consuming this amount daily for 4-8 weeks shows measurable improvements in blood pressure and arterial function in research settings. The compounding effect of consistent small portions outperforms sporadic larger consumption. Think of it like the magnesium situation—your body processes regular doses better than occasional megadoses.

Choose Brands That Disclose Polyphenol Content
Most chocolate bars list calories, fat, and sugar. Few disclose polyphenol content, which is the primary bioactive compound you’re actually after. Brands like Ghirardelli, Lindt Excellence, and several craft chocolate makers publish polyphenol data or third-party test results online. This information typically costs you $0.50-$1 USD more per bar than unlabeled alternatives, but you actually know what you’re consuming. Check the manufacturer’s website before buying.

Store in the Coolest, Driest Part of Your Kitchen
The back of a pantry or a cool closet beats the counter or near appliances. Aim for 15-18°C (59-65°F) if possible. This extends the shelf life and polyphenol stability to 18-24 months rather than 6-12 months. If you’re buying premium dark chocolate for its bioactive compounds, proper storage recaptures roughly 10% of the nutritional value you’d otherwise lose to degradation.

Frequently Asked Questions

Does dark chocolate actually lower blood pressure?

Yes, but with significant caveats. Multiple randomized controlled trials show that 30-50 grams of dark chocolate daily reduces systolic blood pressure by 2-3 mmHg over 4-12 weeks. The mechanism involves the flavonoid epicatechin, which improves endothelial function and blood flow. However, this effect appears in studies using minimally processed, high-polyphenol dark chocolate—not your average grocery store bar. The effect size is modest; it won’t replace a blood pressure medication, but it’s measurable. People with hypertension who added 50 grams of 85% dark chocolate daily showed the most dramatic improvements. If you’re taking blood pressure medication, the chocolate won’t interact negatively, but don’t reduce your medication based on chocolate consumption alone.

How much sugar is actually in dark chocolate versus what I think?

A 100-gram bar of 70% dark chocolate contains 24 grams of sugar, which sounds concerning until you consider that 12 of those grams are offset by dietary fiber. Net carbohydrates (total carbs minus fiber) are closer to 34 grams per 100 grams. Most people mentally compare this to fruit and think chocolate is worse, but a medium banana contains 27 grams of carbohydrates with only 3 grams of fiber, giving a net carb count of 24 grams. Dark chocolate’s net carb profile isn’t dramatically worse than fruit; it’s actually comparable. That said, sugar density per calorie is higher in chocolate—50 grams of chocolate (300 calories, 12g sugar) delivers sugar more concentrated than 50 grams of banana (44 calories, 12g sugar). The key is portion control and eating it slowly, which allows your satiety signals to kick in before you overeat.

Will eating dark chocolate daily make me gain weight?

A 30-50 gram daily serving adds 180-300 calories, which is roughly equivalent to a banana or a slice of whole grain bread. Weight gain depends entirely on whether those calories replace something else in your diet or add to your total. Studies following people who added dark chocolate daily without removing other foods showed no significant weight gain over 12 weeks when the total consumption stayed within reasonable bounds (under 100 grams daily). The satiety benefit matters—the fat and fiber in dark chocolate triggers fullness signals that processed sweets don’t trigger. In one small study, participants eating 25 grams of 85% dark chocolate before lunch consumed 17% fewer calories at lunch compared to those eating white chocolate. This doesn’t mean dark chocolate burns fat; it means it reduces subsequent hunger.

Is raw cacao powder more nutritious than dark chocolate bars?

Raw cacao powder contains more total polyphenols (roughly 20-40% higher) than most processed dark chocolate because no heat destroys compounds during roasting. A tablespoon of unsweetened raw cacao powder contains 180-200mg of polyphenols versus 100-150mg in equivalent dark chocolate. However, raw cacao also contains theobromine and phenylethylamine in higher concentrations, which can cause anxiety or sleep disruption in sensitive people when consumed in large amounts. Raw cacao tastes intensely bitter and requires mixing with sweeteners or fat (milk, butter) to be palatable, at which point you’re adding calories anyway. For polyphenol density per calorie, dark chocolate bars usually win because the processing actually makes polyphenols more bioavailable. Choose whichever form you’ll actually consume consistently—bioavailability matters less than adherence.

Bottom Line

Buy 70-85% dark chocolate from single-origin sources, eat 30-50 grams daily, and pair it with vitamin C sources when possible. The magnesium, fiber, and polyp