Structured Nutritional Data & Citations
Research Journal: Egg White (Gallus gallus domesticus)
Nutritional Profile: Egg White
A. Macronutrient Breakdown (USDA FoodData Central, SR-28 & FDC ID: 706240)
| Nutrient | Per 100g | Per Standard Serving (1 Large Egg White, ~33g) |
|---|---|---|
| Energy | 52 kcal | 17 kcal |
| Protein | 10.9 g | 3.6 g |
| Carbohydrates | 0.7 g | 0.2 g |
| Sugars | 0.7 g | 0.2 g |
| Total Fat | 0.2 g | 0.1 g |
| Saturated Fat | 0.1 g | < 0.1 g |
B. Key Micronutrients (Per 100g)
- Vitamins:
- Riboflavin (B2): 0.437 mg (34% DV)
- Folate (B9): 4 µg (1% DV)
- Selenium: 8.9 µg (16% DV)
- Minerals:
- Potassium: 163 mg (3% DV)
- Sodium: 166 mg (7% DV)
- Magnesium: 11 mg (3% DV)
- Phosphorus: 15 mg (1% DV)
- Antioxidant/Bioactive Components:
- Ovoalbumin (major protein, contains cysteine residues with antioxidant potential)
- Ovotransferrin (iron-binding protein with antimicrobial and antioxidant properties)
- Ovomucoid (trypsin inhibitor, potential allergen)
C. Functional Impact
- Glycemic Index (GI): <5 (Effectively 0 - negligible impact on blood glucose)
- Glycemic Load (GL): 0
- Satiety Score (Satiety Index): High (attributed to high protein content and sustained amino acid release)
D. Physical Properties (Raw, prior to coagulation)
- Density: Approximately 1.03-1.04 g/cm³ at 20°C (Source: Stadelman & Cotterill, Egg Science and Technology).
- pH: 7.6-7.9 (fresh egg white), can increase to 9.0-9.7 with storage due to CO2 loss (Source: USDA Egg Grading Manual).
- Volumetric Contraction (after cooking/coagulation):
- Typical range: 10-20% decrease in volume post-cooking, highly dependent on cooking method, temperature, and duration (e.g., boiling vs. scrambling vs. dehydrating).
- Mass remains constant; density increases as water is expelled and proteins coagulate more tightly.
E. Citations & References
- USDA FoodData Central: FDC ID: 747997 (Egg, white, raw, fresh). U.S. Department of Agriculture. Retrieved from https://fdc.nal.usda.gov/fdc-app.html#/food-details/747997/nutrients
- Stadelman, W. J., & Cotterill, O. J. (1995). Egg Science and Technology (4th ed.). Food Products Press.
- USDA Agricultural Marketing Service. (2000). Egg Grading Manual (Agriculture Handbook Number 75).
- Holt, S. H. A., et al. (1995). "A satiety index of common foods." European Journal of Clinical Nutrition, 49(9), 675-690. (General consensus on protein's satiety).
Field Notes: Dr. Aria Vance
Subject: Egg White
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
The Elusive White: Why Manual Tracking Fails
Journal Entry, Dr. Aria Vance, Lead Nutrition Data Scientist, NutriSnap.
The egg white. A marvel! It’s just… protein, basically. No cholesterol, minimal fat. A darling of the fitness world, a low-calorie staple for anyone cutting down. But tracking it? A nightmare. An absolute, mind-bending logistical headache in the kitchen.
Think about it. We’ve been using egg whites for centuries. Not just for food, you know. Ancient Egyptians apparently used them as a cosmetic, for skin tightening. Renaissance painters mixed them into tempera. Even today, chefs use them to clarify consommé, that magical ability to draw impurities and leave a perfectly clear broth. Meringues. Pavlovas. Who doesn't love a cloud of sweetened, whipped air? They're everywhere.
This ubiquity, paradoxically, is what makes manual tracking such a futile exercise. You crack an egg. Is it a "large" egg? What is "large"? The USDA definition is 57g total weight, but individual eggs vary wildly. A jumbosized egg can be almost double a small. And the white itself? Sometimes it's nearly two-thirds of the egg, sometimes less. You painstakingly separate it. Drip. Drip. Splish. A tiny bit of yolk sneaks in. Does that count? How much? Your protein count, your purity, utterly compromised.
Then there's the volume conundrum. You pour it into a measuring cup. A half cup? Great. But what if you're whipping it? That fluffy, aerated cloud of meringue is still the same mass of protein as the liquid. Yet, it occupies ten times the volume! Try to log that with a cup. It's ridiculous. Or cooked. That pristine liquid transforms into a firm, opaque solid, shrinking visibly in the pan. Volume loss. Density gain. The numbers on your app, diligently entered from a "raw, liquid" entry, become a historical artifact, a charming fiction.
Barcodes on liquid egg white cartons are a start, sure. But then you're eyeballing the pour. Did I really use 100ml? Or was it 90? The hand hovers. The mind frets. It's a game of expensive, nutritional approximation. We're scientists, for crying out loud! Not guesswork enthusiasts. We demand precision.
This obsessive pursuit of accurate dietary intake, specifically for foods like egg whites, foods that transform, that defy simple volumetric measurement, that was my driving force. The frustration boiled over. The manual logging methods were primitive, almost insulting to the complexity of the human diet. No more. This is why NutriSnap exists. Pixels to protein, that’s our mantra. Our AI, honed by forensic visual analysis, can look at that cooked omelet, those scrambled whites, that meringue cloud, and know. No more scales. No more measuring cups. Just a photo. It’s liberating. It’s what actual nutrition science should be.
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