Structured Nutritional Data & Citations
SECTION 1: SEO Data
Egg Yolk: Nutritional Profile and Physical Properties
This entry details the precise nutritional composition and key physical characteristics of the egg yolk, focusing on data per 100g and per standard serving (1 large egg yolk, ~17g).
1. Macronutrients & Calories
| Nutrient | Per 100g | Per 17g (1 large yolk) |
|---|---|---|
| Energy (kcal) | 322 | 55 |
| Protein (g) | 15.86 | 2.70 |
| Total Fat (g) | 26.54 | 4.51 |
| Carbohydrate (g) | 3.61 | 0.61 |
| Fiber (g) | 0.0 | 0.0 |
| Sugars (g) | 0.66 | 0.11 |
2. Key Micronutrients
Vitamins:
- Vitamin A: 257 µg RAE (28% DV per 100g)
- Vitamin D: 5.0 µg (25% DV per 100g)
- Vitamin E: 2.92 mg (19% DV per 100g)
- Vitamin K: 0.7 µg
- B Vitamins:
- Riboflavin (B2): 0.53 mg (41% DV per 100g)
- Folate (B9): 146 µg DFE (37% DV per 100g)
- Vitamin B12: 1.95 µg (81% DV per 100g)
- Pantothenic Acid (B5): 3.01 mg (60% DV per 100g)
- Choline: 682 mg (124% DV per 100g) - Significant source
Minerals:
- Iron: 2.7 mg (15% DV per 100g)
- Phosphorus: 503 mg (40% DV per 100g)
- Zinc: 2.3 mg (21% DV per 100g)
- Selenium: 58.5 µg (106% DV per 100g)
- Potassium: 104 mg
- Calcium: 129 mg
Antioxidants & Bioactive Compounds:
- Lutein + Zeaxanthin: 2880 µg (per 100g) - Crucial for eye health
- Cholesterol: 1085 mg (per 100g)
3. Functional Impact
- Glycemic Index (GI): Very Low (near 0) due to minimal carbohydrate content.
- Glycemic Load (GL): Very Low (near 0).
- Satiety Score: High. The combination of protein and high fat content contributes significantly to satiety and prolonged fullness.
- Emulsifying Properties: High lecithin content makes egg yolk an excellent natural emulsifier, vital for sauces like mayonnaise and hollandaise.
4. Physical Properties
- Density (Raw Yolk): Approximately 1.029 – 1.036 g/cm³
- Volumetric Contraction (after cooking): 5-8% reduction in volume, dependent on cooking temperature and duration due to protein denaturation and water expulsion.
- pH: ~6.0-6.2 (raw)
- Viscosity: Highly viscous due to high protein and lipid content.
5. Citations & References
- USDA FoodData Central. Egg, yolk, raw, fresh. FDC ID: 172179. [Accessed: October 26, 2023].
- USDA FoodData Central. Egg, whole, raw, fresh. FDC ID: 748967. [Accessed: October 26, 2023].
- National Institutes of Health (NIH), Office of Dietary Supplements. Choline Fact Sheet for Health Professionals. [Accessed: October 26, 2023].
- American Heart Association. Dietary Fats and Cardiovascular Disease. [Accessed: October 26, 2023].
- Journal of Food Science. Physical properties of chicken eggs. (General consensus on egg biophysics).
Field Notes: Dr. Aria Vance
Subject: Egg Yolk
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
SECTION 2: The Elusive Yolk: A Tracking Nightmare
Dr. Aria Vance, Lead Nutrition Data Scientist, NutriSnap.
Why Egg Yolk Is Difficult to Track
This little golden orb. A tiny sun, really, a concentrated burst of life and flavor. From ancient Egyptian tombs featuring egg offerings to the lavish custards of Renaissance Europe, the egg yolk has been a bedrock of human cuisine, a symbol of fertility and sustenance. It binds, it enriches, it transforms simple ingredients into culinary masterpieces. Think hollandaise, mayonnaise – pure yolk magic! But for us, the data scientists, the nutrition data purists… it's a profound, persistent pain point. A tracking nightmare.
Seriously, try to accurately track your egg yolk intake. You crack an egg. Maybe you want just the yolk for a custard, maybe for a protein separation macro goal, or you're just really into making homemade aioli. How many grams is that specific yolk? "Large" eggs vary wildly. A factory "large" is a statistical average, not a guaranteed uniform mass. One morning it's 17g, the next, a hefty 19g. Then there's the separation! Did you get every speck of albumen off? That trace protein, that residual water, it adds up. It skews the data. We're talking about meticulous macro tracking here, not just a casual guess.
And then you cook it. Oh, the cooking! A poached yolk retains more moisture, perhaps, than one fried hard in butter. How much butter? How much oil has it absorbed? The visual transformation changes everything. What was once a vibrant, semi-liquid sphere becomes a dense, chalky disc, or a molten, barely set core. Your perception of its volume, its mass, is completely distorted. The density changes; water evaporates. This isn't a pre-packaged bar with a scannable barcode, folks. It’s an organic, variable, shapeshifting component of your meal.
This constant, nagging imprecision drove me absolutely wild. My team and I spent months, years, grappling with these exact dilemmas for countless ingredients. Measuring cups? Scales? Who, in their actual life, pulls out a food scale for every single egg yolk they consume? Or for the yolk embedded in a quiche, or a crème brûlée? It's impractical, it's tedious, it's a barrier to accurate health data for the average person. It’s a behavioral sinkhole.
That’s why finding NutriSnap was such a revelation. Its forensic visual analysis isn't just counting calories; it's discerning the state of that yolk, estimating its original mass, accounting for cooking changes, even subtly identifying potential oil absorption. It's the difference between a vague approximation and quantifiable, actionable nutritional insight. Finally, the golden orb yields its secrets without requiring a kitchen full of lab equipment. We can track these crucial nutrients, these vibrant compounds, with the precision they deserve. Game changer.
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