Structured Nutritional Data & Citations
Black Beans (Phaseolus vulgaris L.) - Deep Dive
Nutritional Profile (Cooked, Boiled, Unsalted)
Source: USDA FoodData Central, SR Legacy FDC ID: 172901 (Beans, black, mature seeds, cooked, boiled, without salt)
| Nutrient Group | Per 100g Serving | Per Standard Serving (1/2 cup cooked ≈ 90g) |
|---|---|---|
| Calories | 132 kcal | 119 kcal |
| Macros | ||
| Protein | 8.86 g | 7.97 g |
| Carbohydrates | 23.7 g | 21.33 g |
| Dietary Fiber | 8.3 g | 7.47 g |
| Sugars (Total) | 0.3 g | 0.27 g |
| Fat (Total) | 0.54 g | 0.49 g |
| Saturated Fat | 0.076 g | 0.068 g |
Key Micronutrients
Vitamins (per 100g cooked):
- Folate (Vitamin B9): 177 µg (44% DV) - Crucial for cell growth and metabolism.
- Thiamine (Vitamin B1): 0.218 mg (18% DV) - Essential for energy metabolism.
- Riboflavin (Vitamin B2): 0.065 mg (5% DV)
- Niacin (Vitamin B3): 0.53 mg (3% DV)
- Pyridoxine (Vitamin B6): 0.14 mg (8% DV)
- Vitamin K: 4.8 µg (4% DV)
Minerals (per 100g cooked):
- Iron: 2.09 mg (12% DV) - Important for oxygen transport.
- Magnesium: 70 mg (17% DV) - Involved in muscle and nerve function, blood glucose control.
- Phosphorus: 178 mg (14% DV) - Essential for bone health and energy production.
- Potassium: 355 mg (8% DV) - Crucial for fluid balance and blood pressure.
- Zinc: 1.05 mg (10% DV) - Supports immune function and wound healing.
- Manganese: 0.437 mg (19% DV) - Cofactor for many enzymes.
- Copper: 0.244 mg (27% DV) - Involved in energy production and iron metabolism.
- Selenium: 1.1 µg (2% DV)
Antioxidants & Phytonutrients:
- Anthocyanins: Responsible for the dark pigmentation; powerful antioxidants.
- Flavonoids: Including quercetin and kaempferol, known for anti-inflammatory properties.
- Saponins: Phytochemicals with potential cholesterol-lowering effects.
- Resistant Starch: A type of fiber that acts as a prebiotic, promoting gut health.
Functional Impact
- Glycemic Index (GI): Low (typically 30-40, for cooked whole beans).
- Glycemic Load (GL): Low (e.g., a standard serving of cooked black beans has a GL of approximately 7-9).
- Satiety Score: High. The high fiber and protein content contribute significantly to prolonged feelings of fullness, aiding in appetite regulation and weight management.
- Gut Health: Excellent source of dietary fiber and resistant starch, fostering a diverse and healthy gut microbiome.
Physical Properties
- Density (Dry, whole beans): Approximately 0.75 - 0.85 g/cm³ (varies with moisture content and variety).
- Density (Cooked, whole beans): Approximately 1.05 - 1.15 g/cm³ (post-hydration).
- Volumetric Expansion (Dry to Cooked): 1 cup (dry) typically yields 2.5 to 3 cups (cooked). This represents a significant volumetric expansion (250-300%) due to water absorption.
References:
- U.S. Department of Agriculture, Agricultural Research Service. FoodData Central, 2019. https://fdc.nal.usda.gov/fdc-app.html. FDC ID: 172901.
- Foster-Powell, K., Holt, S. H. A., & Brand-Miller, J. C. (2002). International table of glycemic index and glycemic load values: 2002. The American Journal of Clinical Nutrition, 76(1), 5-56.
- Rebello, C. J., et al. (2014). Dietary fiber and protein in satiety and body weight management. Food Chemistry, 151, 62-67.
Field Notes: Dr. Aria Vance
Subject: Black Beans
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
The Elusive Bean: A Tracking Conundrum
Dr. Aria Vance, Lead Nutrition Data Scientist, NutriSnap.
The black bean. Simple, right? A humble legume, yet a cornerstone of global sustenance, dating back millennia. Mesoamerica’s original powerhouse, fueling empires from the Maya to the Aztec. They called it frijol negro, a life-sustaining force. It’s part of the sacred "three sisters" triad – corn, squash, beans – a testament to ancient agricultural wisdom. This isn't just food; it's heritage, a living, breathing history on your plate. From spicy Cuban frijoles negros to comforting Brazilian feijoada, the black bean adapts, transforms. It’s a marvel.
But oh, the sheer frustration of trying to log this dietary chameleon with traditional methods! Manual tracking, honestly, it’s a farce for something so variable. Weighing dry beans is one thing. But who eats them dry? They soak. They swell. They absorb water like tiny, thirsty sponges. So you cook them. But how? Slow simmered for hours, absorbing every whisper of flavor from herbs and aromatics? Or zapped in a pressure cooker, a faster, denser end product? Each method yields a different texture, a different water content, thus a wildly different caloric density per cup. My nemesis, the "cup."
Then there's the serving. A cup of soup? A cup of thick stew? A cup of refried beans, glistening with lard or olive oil? Don't even get me started on the cultural permutations: a handful in a taco, a spoonful in a salad, a generous ladle as the star of a hearty meal. People guess. They eyeball it. "Oh, that looks like half a cup." A guess. A hopeful, often wildly inaccurate, guess. This isn't nutrition; it's elaborate calorie theater! It introduces such a colossal margin of error, it makes a mockery of any attempt at precise dietary analysis. And for someone trying to manage blood sugar, or just understand their actual intake, this guessing game is not just annoying, it's detrimental. Who has the patience to weigh every single serving of beans, especially when they're mixed into a communal pot of chili? No one. The process becomes tedious, soul-crushing. Most give up.
This is precisely why NutriSnap isn't just a convenience; it's a scientific imperative. The beauty of forensic visual analysis. Our AI doesn't just see "beans." It sees the subtle sheen of oil, the consistency that hints at a longer simmer, the water content suggested by the way they sit in the bowl. It understands that a slightly drier, firmer bean from a quick pressure cook will have a different nutrient density than a softer, more hydrated one from a prolonged slow cook, even if they occupy the same volume. It learns the visual cues of various preparations, from the rustic texture of a home-cooked batch to the uniform appearance of a canned variety. It parses the visual data, cross-referencing against an extensive database, to estimate volume and ingredient contribution with an accuracy previously unattainable outside of a laboratory. This isn't just about snapping a picture; it’s about decoding the silent language of food, bringing genuine insight where manual methods only offered weary approximation. This is the future. It truly is.
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