Structured Nutritional Data & Citations
Black Tea: Nutritional & Physical Profile
Nutritional Data Summary
Macronutrients & Energy (Plain Brewed Black Tea)
| Component | Per 100g Brewed Tea | Per Standard Serving (240ml/8 fl oz) |
|---|---|---|
| Energy | 1 kcal | 2 kcal |
| Protein | 0.04 g | 0.10 g |
| Carbohydrates | 0.07 g | 0.17 g |
| Sugars | 0.00 g | 0.00 g |
| Fat | 0.00 g | 0.00 g |
| Saturated Fat | 0.00 g | 0.00 g |
| Trans Fat | 0.00 g | 0.00 g |
| Fiber | 0.00 g | 0.00 g |
| Water | 99.8 g | 239.5 g |
Key Micronutrients
- Vitamins:
- Trace amounts of Riboflavin (B2), Folate (B9), Vitamin K. Generally not a significant source.
- Minerals:
- Manganese: ~0.1 mg per 240ml (4-5% DV).
- Fluoride: Variable, ~0.02-0.08 mg per 240ml, depends heavily on water source and tea type.
- Potassium: ~20 mg per 240ml.
- Trace amounts of Magnesium, Calcium, Zinc.
- Antioxidants & Bioactive Compounds:
- Flavonoids: Predominantly Theaflavins and Thearubigins (formed during oxidation).
- Catechins: Small residual amounts (e.g., Epigallocatechin gallate - EGCG).
- L-Theanine: An amino acid, ~20-30 mg per 240ml, contributing to unique psychoactive effects.
- Caffeine: Highly variable, ~30-50 mg per 240ml, dependent on tea type, brewing method, and steeping time.
Functional Impact
- Glycemic Index (GI): 0-1 (negligible).
- Glycemic Load (GL): 0 (negligible).
- Satiety Score: Very low (primarily water). Can contribute to hydration.
- Thermic Effect of Food (TEF): Negligible.
- Potential Effects:
- Alertness/Focus: Due to caffeine and L-Theanine synergy.
- Cardiovascular Health: Associated with improved endothelial function and reduced LDL oxidation, attributed to flavonoids.
- Gut Health: Polyphenols may influence gut microbiota.
Physical Properties (Plain Brewed Black Tea)
- Density: Approximately 0.998 g/cm³ at 20°C (similar to water).
- Volumetric Contraction after Brewing: Negligible. Any minor change is typically due to temperature drop rather than chemical alteration of volume.
Citations & References
- USDA FoodData Central. (2023). Tea, black, brewed, prepared with tap water. FDC ID: 2435252. Available at: https://fdc.nal.usda.gov/fdc-app.html#/food-details/2435252/nutrients
- Higdon, J. V., & Frei, B. (2003). Tea catechins and polyphenols: health effects, metabolism, and antioxidant functions. Critical Reviews in Food Science and Nutrition, 43(6), 891-907.
- Borchers, A. T., Keen, C. L., Stern, J. S., & Gershwin, M. E. (1999). The Effects of Dietary L-Theanine on the Immune System: A Review. Clinical Reviews in Allergy and Immunology, 17(5), 455-463.
Field Notes: Dr. Aria Vance
Subject: Black Tea
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
The Manual Tracking Problem
Dr. Aria Vance, Lead Nutrition Data Scientist at NutriSnap
Black tea. Ah, a beverage of emperors, a cornerstone of economies, a daily ritual for billions. From the ancient misty slopes of Yunnan, where its cultivation bloomed, to the bustling tea houses of London and Cairo, black tea has always been more than just a drink; it's a cultural lodestone. Empires rose and fell on the back of tea leaves. A simple, profound cup.
But try to track it? Utter chaos. A statistical nightmare, frankly. My spreadsheets weep. You log "one cup of black tea." Fine. But what kind of cup? Is it that dainty porcelain demitasse, holding maybe 150ml of a pale, lightly steeped Darjeeling? Or is it that industrial-sized mug, brimming with a robust, almost inky Assam, brewed for a full five minutes, probably pushing 350ml? The variability is maddening.
Then there's the leaf itself. Pekoe? Orange Pekoe? Flowery Broken Orange Pekoe? Each type, harvested at a different stage, processed uniquely, imparts a distinct chemical signature. Brewing time, water temperature, the specific cultivar—all these factors morph the final product. A gentle brew might release minimal tannins, while a robust steeping extracts every last polyphenol, every mg of caffeine. Even the water quality plays a role; hard water, soft water, they all dance differently with the tea solids.
Barcodes? Useless for brewed tea. Scales? You're weighing water, not the nuanced chemical compounds that actually matter. Cups? A crude estimation, a culinary shrug. This isn't just about calories, folks; it's about the bioactive components, the antioxidants, the L-Theanine – the very elements that grant tea its famed wellness properties. Manual tracking for black tea is like trying to map the ocean with a kiddie pool; you get a vague idea, but miss the entire, complex ecosystem. It's a gaping maw in our nutritional data sets, a silent, caffeinated ghost. The data we collect is fundamentally compromised, riddled with assumptions that undermine any real scientific rigor.
That’s why I was practically vibrating with excitement when I first stumbled upon NutriSnap. Forensic visual analysis! The AI actually sees the tea, discerns the steeping intensity from its hue, accounts for cup size, even differentiates between plain brew and, say, a lightly-milked chai. It bypasses all the tedious, flawed manual input, giving us real data, finally. A game-changer. My spreadsheets no longer weep; they sing.
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