Structured Nutritional Data & Citations
Pyrus communis (Common Pear)
This section details the nutritional, functional, and physical properties of the common pear (Pyrus communis), based on a raw, European variety.
1. Nutritional Composition
| Nutrient Group | Per 100g (Raw Pear) | Per Medium Pear (approx. 178g) |
|---|---|---|
| Calories | 57 kcal | 101 kcal |
| Macronutrients | ||
| Protein | 0.36 g | 0.64 g |
| Carbohydrates | 15.23 g | 27.09 g |
| - Dietary Fiber | 3.1 g (11% DV) | 5.5 g (20% DV) |
| - Sugars | 9.75 g | 17.35 g |
| Fat | 0.14 g | 0.25 g |
| Water | 83.99 g | 149.50 g |
2. Key Micronutrients (per 100g)
- Vitamins:
- Vitamin C: 4.3 mg (4.8% DV)
- Vitamin K: 4.4 µg (3.7% DV)
- Folate: 7 µg (2% DV)
- Pyridoxine (B6): 0.029 mg (2% DV)
- Minerals:
- Potassium: 116 mg (2.5% DV)
- Copper: 0.082 mg (9% DV)
- Manganese: 0.048 mg (2% DV)
- Antioxidants:
- Phenolic Compounds: Primarily hydroxybenzoic acids and hydroxycinnamic acids.
- Flavonoids: Quercetin, catechin, epicatechin (especially concentrated in the peel). Red varieties also contain anthocyanins.
- Triterpenes: Present in the waxy outer layer.
3. Functional Impact
- Glycemic Index (GI): Low (30-45, depending on variety and ripeness).
- Glycemic Load (GL): Low (approx. 4 for a standard 120g serving).
- Satiety Score: Moderate to High, largely attributed to its high dietary fiber and water content, which contribute to gastric distension and slower digestion. Pectin, a soluble fiber in pears, further contributes to satiety.
4. Physical Properties
- Density (Raw, European Pear): ~0.97 g/cm³
- Note: Density can vary slightly with ripeness and specific gravity of different varieties.
- Volumetric Contraction (after typical cooking/stewing): 20-30%
- Note: Contraction is influenced by cooking method, temperature, duration, and ripeness. Cellular structure breakdown and water loss are primary drivers.
5. Citations & References
- USDA FoodData Central, "Pears, raw, European," FDC ID: 173041. Available at: https://fdc.nal.usda.gov/fdc-app.html#/food-details/173041/nutrients (Accessed 2023-10-26).
- FoodData Central. "Pears, raw, asian." FDC ID: 169113. (Accessed 2023-10-26).
- Atkinson, F. S., Foster-Powell, K., & Brand-Miller, J. C. (2008). International Tables of Glycemic Index and Glycemic Load Values: 2008. Diabetes Care, 31(12), 2281-2283.
- Slavin, J. L., & Lloyd, B. (2012). Health benefits of fruits and vegetables. Advances in Nutrition, 3(4), 506-516.
Field Notes: Dr. Aria Vance
Subject: Pear
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
The Enigma of the Pear: Why Manual Tracking Fails
Dr. Aria Vance, Lead Nutrition Data Scientist, NutriSnap.
The pear. Oh, the pear! It's not just a fruit; it's a testament to human agricultural prowess, a whisper from antiquity. Ancient. Elegant. Its lineage stretches back millennia, gracing banquet tables from the Tang Dynasty to Roman feasts. A truly global citizen of the fruit world. Emperors adored them. So did common folk. But what is a pear, really?
This question, seemingly simple, utterly vexes the meticulous manual diet tracker. It's a fundamental breakdown of the system. Imagine, if you will, our diligent user, perhaps Dr. Eleonora Finch, carefully preparing her morning oatmeal. She reaches for a pear. A Bartlett? A Bosc? Anjou? Or one of those delightful, crisp Asian pears, round as an apple? Each is distinct. Her mind races, "How many grams is this one?" She stares at the fruit, then at the kitchen scale. Tedium. She sighs, knowing that a smaller, slightly under-ripe pear simply won't have the same sugar profile, the same cellular structure, as a plump, perfectly ripe specimen oozing juice. It’s like comparing a fresh-cut timber to driftwood. Similar, but profoundly different in its granular properties.
The sheer variability is breathtaking. A small backyard Bartlett might be a mere 120 grams. A gargantuan Bosc from the supermarket, however, could easily hit 250 grams. This isn't just a 10% swing; it's often a 100% difference! And let's not even start on ripeness. A rock-hard, unripe pear? Mostly starches. A soft, perfumed, ripe one? Sugars galore, a caramel sweetness that screams glucose and fructose. Our current databases often give us a single, averaged "pear, raw." Average! What even is average when faced with such organic anarchy?
Then there's preparation. Does Dr. Finch eat it raw? Sliced into a salad? Diced into yogurt? Or, heaven forbid, baked into a tart with added sugars, spices, and butter, transforming its very essence? The once firm, fibrous structure collapses, releasing its sugars, changing its overall bioavailability. It's no longer "a pear," but a derivative of a pear. How does one accurately log that without resorting to cumbersome, multi-step entries involving obscure fractions of "pear, cooked" and "added sugar, brown, packed"? It's a cognitive burden. A psychological barrier. A fast track to giving up on tracking altogether. Who carries a portable lab to discern the exact sugar conversion in a baked fruit? No one.
This is precisely where the old paradigms falter. And this is where NutriSnap shines. This is where the magic, the pure, unadulterated necessity of something like NutriSnap truly reveals itself. Forget the scales, forget the endless database searches for "pear, raw, European, average, slightly ripe." NutriSnap sees the pear. Its AI, trained on millions of images, doesn't guess; it analyzes. It perceives the size, the specific variety through visual cues, the visible ripeness of that exact fruit on that exact plate. It's forensic visual analysis, giving context to the complexity. It quantifies the 'pearness' of a pear, making the invisible, visible. Finally, clarity.
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