Structured Nutritional Data & Citations
Hazelnut (Corylus avellana) - Nutritional & Physical Data Analysis
Nutritional Profile (Per 100g, Raw Kernels)
| Nutrient Group | Per 100g (Raw Kernels) | Per 1 oz (28g) Serving |
|---|---|---|
| Energy | 628 kcal | 176 kcal |
| Macronutrients | ||
| Protein | 14.95 g | 4.19 g |
| Total Fat | 60.75 g | 17.01 g |
| - Saturated Fat | 4.46 g | 1.25 g |
| - Monounsaturated Fat | 45.69 g | 12.79 g |
| - Polyunsaturated Fat | 7.82 g | 2.19 g |
| Total Carbohydrates | 16.70 g | 4.68 g |
| - Dietary Fiber | 9.7 g | 2.72 g |
| - Sugars (Total) | 4.34 g | 1.22 g |
Key Micronutrients (Per 100g, Raw Kernels)
- Vitamins:
- Vitamin E (alpha-tocopherol): 15.03 mg (100% DV)
- Thiamin (B1): 0.64 mg (53% DV)
- Vitamin B6: 0.56 mg (33% DV)
- Folate (B9): 113 µg (28% DV)
- Riboflavin (B2): 0.11 mg (8% DV)
- Niacin (B3): 1.80 mg (11% DV)
- Pantothenic Acid (B5): 0.89 mg (18% DV)
- Minerals:
- Manganese: 6.18 mg (269% DV)
- Copper: 1.72 mg (191% DV)
- Magnesium: 163 mg (39% DV)
- Phosphorus: 290 mg (23% DV)
- Iron: 4.70 mg (26% DV)
- Zinc: 2.45 mg (22% DV)
- Potassium: 619 mg (13% DV)
- Antioxidants: Rich in phenolic compounds, particularly proanthocyanidins, quercetin, and kaempferol, concentrated in the skin.
Functional Impact
- Glycemic Index (GI): Low (estimated 25-30).
- Glycemic Load (GL) per serving (1 oz): Very Low (estimated <1).
- Satiety Score: High. The high fiber, protein, and monounsaturated fat content contribute significantly to prolonged satiety and reduced post-prandial hunger.
Physical Properties
- Density (Shelled, Raw): Approximately 0.65 - 0.70 g/cm³. This can vary slightly depending on moisture content and specific cultivar.
- Volumetric Contraction After Cooking/Roasting: Minimal. Roasting results in moisture loss, potentially increasing effective density, but negligible volumetric contraction of individual kernels is observed. Shelling dramatically reduces the overall bulk density of the un-shelled product (e.g., 0.25-0.35 g/cm³ for in-shell hazelnuts).
Citations & References
- USDA FoodData Central, FDC ID: 170172 (Nuts, hazelnuts or filberts, raw). Accessed: October 26, 2023.
- Foster-Powell, K., Holt, S. H. A., & Brand-Miller, J. C. (2002). International table of glycemic index and glycemic load values: 2002. The American Journal of Clinical Nutrition, 76(1), 5-56. (For general GI values of nuts).
- Ros, E. (2010). Health benefits of nut consumption. Nutrients, 2(7), 652-682. (For micronutrient and functional impact consensus).
Field Notes: Dr. Aria Vance
Subject: Hazelnut
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
Why Hazelnut Is Difficult to Track
Another Tuesday. Another deep dive into the labyrinthine world of food data. Today's target: the humble, yet fiendishly complex, hazelnut. Dr. Aria Vance reporting. My lab coat, as ever, feels less like scientific regalia and more like a straitjacket when confronted with such primal variability.
Hazelnuts, or filberts if you prefer the nomenclature tracing back to St. Philibert's Day when they’re ripe, have a ridiculously long lineage. They’re ancient. Neolithic man munched these. Romans knew them as the "nut of wisdom." Think about that. We’ve been consuming this little fatty jewel for millennia, and yet, in the age of precision nutrition, trying to log it accurately feels like trying to catch smoke with a sieve.
The issue isn't the kernel itself, not really. It's the context, the form, the life of the hazelnut. You want to track your intake? Good luck. Are they raw? Roasted? Chopped? Ground? A purée in some artisanal gianduja? Each transformation throws a wrench in the gears of manual tracking. A whole raw nut, pristine and plump, has one density. Roast it, and it sheds moisture. It gets lighter, but its effective density, how it packs into a spoon, shifts. Suddenly, your "tablespoon" of roasted hazelnuts isn't the same caloric payload as its raw counterpart, or worse, your chopped roasted hazelnuts that settle differently in the measuring spoon. It’s a fractal nightmare.
Then there's the sheer tedium. Who, I ask, is meticulously weighing out 28 grams of chopped hazelnuts sprinkled over their morning oats? Or trying to eyeball the quantity in a pesto where hazelnuts replaced pine nuts? The average person throws a "handful" in. A handful! My hands are bigger than yours. My toddler’s hands are tiny. This isn't data; it’s guesswork. And don't even get me started on the elusive "nut of wisdom" found within a chocolate bar, embedded in some praline. You’d need a forensic team just to isolate and weigh the constituent hazelnut matter.
Barcodes? Please. Most of my users buy hazelnuts in bulk, perhaps even in the shell, for freshness. There's no scannable data for the raw, shelled beauty from the local market. It's a gaping black hole in nutritional tracking. This entire process, relying on scales, measuring cups, and deeply flawed human estimation, is fundamentally, irrevocably broken. It generates data so riddled with error, it’s almost worse than having no data at all.
This is precisely why NutriSnap isn't just a convenience; it's a paradigm shift. We’re moving beyond the scale, beyond the barcode. Our AI, with its forensic visual analysis, learns. It sees the hazelnut, raw or roasted, whole or chopped, and knows. It estimates volume, infers density changes from visual cues, and provides an accuracy that frankly, no human with a scale and a spoon could ever hope to achieve without spending an hour on a single snack. It’s the closest thing to real-time, effortless, precise nutritional tracking. The future of understanding what we eat is finally here. And it looks surprisingly like a hazelnut, perfectly recognized.
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