Structured Nutritional Data & Citations
Journal Entry: Green Tea Nutritional Profile
SECTION 1: SEO Data
Green Tea (Brewed, Unsweetened)
This data pertains to green tea prepared with water, without added milk, sugar, or other ingredients.
1. Macronutrients & Energy (Per 100g / Per Standard Serving)
- Standard Serving Definition: One 240ml (approx. 8 fl oz) cup of brewed green tea.
| Nutrient | Per 100g Brewed Tea (approx. 100 mL) | Per Standard Serving (240mL) | Unit |
|---|---|---|---|
| Energy | 1 | 2 | kcal |
| Protein | 0.1 | 0.2 | g |
| Total Fat | 0 | 0 | g |
| Carbohydrate | 0.2 | 0.5 | g |
| - Sugars | 0 | 0 | g |
| Fiber | 0 | 0 | g |
| Water | 99.8 | 239.5 | g |
2. Key Micronutrients & Bioactive Compounds
| Category | Nutrient/Compound | Per 240mL Serving (Approximate) | Unit | Key Functions |
|---|---|---|---|---|
| Vitamins | Vitamin K (Phylloquinone) | 2.4 | µg | Blood coagulation, bone metabolism. |
| Riboflavin (B2) | 0.01 | mg | Energy metabolism, cellular growth. | |
| Folate | 5 | µg | DNA synthesis, cell repair. | |
| Minerals | Manganese | 0.1 | mg | Bone health, antioxidant defense. |
| Fluoride | 0.15 - 0.5 | mg | Dental health (variable by tea type/water source). | |
| Potassium | 20 | mg | Fluid balance, muscle contraction. | |
| Antioxidants/Bioactives | Catechins (Total) | 100 - 400 | mg | Potent antioxidants, anti-inflammatory effects. |
| - Epigallocatechin gallate (EGCG) | 60 - 200 | mg | Most abundant and studied catechin, strong antioxidant. | |
| L-Theanine | 20 - 60 | mg | Amino acid, promotes relaxation and focus, modulates caffeine effects. | |
| Caffeine | 20 - 50 | mg | Central nervous system stimulant, varies significantly by brew and tea type. | |
| Quercetin | Trace | mg | Flavonoid, antioxidant, anti-inflammatory. |
3. Functional Impact
- Glycemic Index (GI): 0 (Very Low)
- Glycemic Load (GL): 0 (Very Low)
- Satiety Score: Very Low (Primarily a hydrating beverage; minimal caloric contribution to satiety.)
- Hydration: Excellent source of hydration.
4. Physical Properties (Brewed Green Tea)
- Density: Approximately 1.00 g/cm³ at room temperature (similar to water).
- Volumetric Contraction (after brewing): Negligible. The volume of prepared tea is virtually equal to the volume of water used, minus any absorbed by tea leaves (which is minimal).
- pH: Typically 7.0 (neutral) for water, but brewed green tea can range from 6.0 to 7.0 depending on type and steep time, making it slightly acidic.
5. Citations & References
- USDA FoodData Central (FDC ID: 2048695): Green tea, brewed, without sugar. U.S. Department of Agriculture, Agricultural Research Service. https://fdc.nal.usda.gov/fdc-app.html#/food-details/2048695/nutrients (Accessed November 1, 2023).
- Khan, N., et al. (2018). "Green Tea and Its Health Benefits: A Review." Journal of Clinical Nutrition & Dietetics, 4(1), 169. (General reference for catechin and L-Theanine ranges).
- Heckman, M. A., et al. (2010). "Caffeine Content of Brewed Teas." Journal of Food Science, 75(1), C77-C83. (For caffeine variability).
Field Notes: Dr. Aria Vance
Subject: Green Tea
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
SECTION 2: Field Notes
The Elusive Data of the Daily Brew
Dr. Aria Vance, Lead Nutrition Data Scientist, NutriSnap.
The verdant mystery. A cup of green tea. People herald it—rightly so—as a wellness elixir. From the serene tea ceremonies of Japan, where Gyokuro is meticulously prepared, to the everyday bags steeped casually across the globe, its journey is ancient. Originating in China thousands of years ago, Camellia sinensis leaves have been steeped for health, for ritual, for simple enjoyment. It traveled Silk Roads, fueled Zen monks, became a cornerstone of diverse cultures. This beverage, it's more than just a drink. It's history in a cup. A story of human connection to nature, to wellness.
But tracking it? Oh, the agony!
Imagine, a user logs "green tea." What does that mean? Is it Matcha, a powdered powerhouse, whisked into frothy suspension, where every particle is consumed? Or Sencha, delicate leaves steeped, then discarded? Bancha, a more robust, coarser leaf? Each type, each preparation method, fundamentally alters the extraction of those precious catechins, L-Theanine, even the trace minerals. The variables are maddening. Water temperature? Crucial! Too hot, bitterness. Too cold, under-extraction. Steeping time? Five seconds changes everything. Five minutes changes more. The dry weight of leaves used? A pinch? A heaped teaspoon? No two users, hell, no two brews from the same user, are identical.
Manual tracking falls flat on its face. How do you barcode a loose leaf? You can't. Weighing dry leaves before brewing gives you nothing about what actually ends up in the liquid. We tell users, "log one serving." But what's a serving? A tiny demitasse? A gargantuan travel mug? It's a nutritional ghost in the machine, a fluid, ever-changing entity. This isn't like a banana, which has a fairly consistent nutritional profile regardless of how you eat it. This is a dance of diffusion, a biochemical negotiation between leaf and water. And don't even get me started on the ubiquitous additions: a dollop of honey, a splash of oat milk. These seemingly innocent additions introduce significant caloric and macro changes that most users only log for the tea, completely missing the true impact. It's frustrating. It's unreliable. Our data, my beautiful data, becomes a chaotic mess of approximations and educated guesses.
This is why NutriSnap is a game-changer. Forensic visual analysis. Our AI doesn't just see "green tea"; it sees the depth of color, the consistency, the volume in the specific vessel. It learns user patterns: "Dr. Vance usually drinks a light Sencha in her ceramic mug." It can even infer the presence of likely additives based on opaqueness or color shifts, prompting the user for confirmation. No more guessing games about extraction rates or serving sizes. It's about capturing reality. This technology... it’s going to revolutionize dietary precision. Finally, the nuanced story of that everyday cup can be accurately told.
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