Structured Nutritional Data & Citations
Nutritional Profile: Beef Steak (Cooked, Top Sirloin, Lean Trimmed)
This profile provides data for a commonly consumed lean cut of beef steak, cooked to medium doneness, with visible fat trimmed. Nutritional values can vary significantly based on cut, marbling, cooking method, and doneness.
Macronutrients & Calories
| Nutrient | Per 100g Cooked | Per Standard Serving (170g / 6oz Cooked) |
|---|---|---|
| Calories | 210 kcal | 357 kcal |
| Protein | 29.5 g | 50.2 g |
| Carbohydrates | 0 g | 0 g |
| Fat (Total) | 9.0 g | 15.3 g |
| - Saturated Fat | 3.5 g | 6.0 g |
| - Monounsaturated Fat | 3.8 g | 6.5 g |
| - Polyunsaturated Fat | 0.5 g | 0.9 g |
| Cholesterol | 80 mg | 136 mg |
Key Micronutrients (Per 100g Cooked)
- Vitamins:
- Vitamin B12: 2.5 µg (104% DV) - Essential for neurological function and red blood cell formation.
- Niacin (B3): 7.5 mg (47% DV) - Supports metabolism and DNA repair.
- Vitamin B6: 0.4 mg (24% DV) - Involved in amino acid metabolism.
- Riboflavin (B2): 0.25 mg (19% DV) - Critical for energy production.
- Vitamin D: 0.5 µg (2% DV) - Bone health, immune function (variable).
- Minerals:
- Iron (Heme): 3.2 mg (18% DV) - Highly bioavailable; crucial for oxygen transport.
- Zinc: 5.0 mg (45% DV) - Immune function, protein synthesis.
- Selenium: 35 µg (64% DV) - Antioxidant defense, thyroid health.
- Phosphorus: 250 mg (20% DV) - Bone and teeth formation, energy metabolism.
- Potassium: 350 mg (7% DV) - Electrolyte balance, blood pressure regulation.
- Bioactive Compounds / Antioxidants:
- Creatine: ~350-400 mg - Supports muscle energy production.
- Carnosine: ~200-250 mg - Dipeptide, acts as an antioxidant and buffer in muscle.
- L-Carnitine: ~80-90 mg - Role in fat metabolism.
- Glutathione: Precursors present, though content varies.
Functional Impact
- Glycemic Index (GI): 0 (Negligible) - Steak has virtually no carbohydrates, thus it does not significantly impact blood glucose levels.
- Glycemic Load (GL): 0 (Negligible)
- Satiety Score: Very High - Due to its high protein and fat content, steak is exceptionally satiating, contributing to prolonged feelings of fullness. (Reference: Holt, S. H., et al. (1995). "A satiety index of common foods." European Journal of Clinical Nutrition, 49(9), 675-690. Protein-rich foods generally rank highest for satiety.)
Physical Properties
- Density (Cooked, Medium): Approximately 1.15 g/cm³ - Varies with fat content and doneness. (Reference: Based on general food density ranges; specific studies on cooked beef density are limited but fall within this range.)
- Volumetric Contraction After Cooking: 25-30% - Average shrinkage for a typical steak cooked to medium, largely due to water loss and protein coagulation. (Reference: Estimated from culinary observations and food science texts on meat cooking; exact figures depend on initial cut, fat, and cooking method.)
Citations & References
- USDA FoodData Central (SR Legacy ID 13344: Beef, sirloin, top sirloin, lean only, cooked) - Primary source for nutritional data. Available at: https://fdc.nal.usda.gov/fdc-app.html#/food-details/2157166/nutrients
- Holt, S. H., et al. (1995). "A satiety index of common foods." European Journal of Clinical Nutrition, 49(9), 675-690.
- General consensus in meat science and human nutrition for other values and functional impacts.
Field Notes: Dr. Aria Vance
Subject: Steak
Focus: Volumetric expansion/contraction, historical context, tracking challenges.
The Elusive Steak: Why Manual Tracking Fails
Journal Entry: 2024-03-08, Dr. Aria Vance
Steak. Ah, steak. It’s more than just sustenance; it’s a cultural touchstone, a primal indulgence etched into the human experience since our early ancestors first roasted meat over open flames. Think about it: the very word "steak" conjures images of robust feasting, of celebratory meals, of connection to the land and the animal. From prehistoric hunters sharing a kill to Roman gourmands, through medieval banquets and into the modern era of the upscale steakhouse, beef has always symbolized power, nourishment, and often, status. The sheer variety! Ribeye, filet mignon, porterhouse, sirloin—each cut presents a distinct symphony of texture and flavor, a unique culinary narrative.
But this rich tapestry, this beloved dietary staple, is an absolute nightmare for precise nutritional tracking. A total headache. You try to log it. "Steak, cooked." Which steak? Was it a lean sirloin, or a marbled ribeye swimming in fat? The difference in caloric density, especially from fat, is enormous. Then there's the doneness factor. Rare, medium-rare, well-done. Each degree of heat fundamentally alters the meat's structure, affecting moisture content and thus, true cooked weight. The chef’s hand, the searing, the resting period – all these subtle variables conspire against the earnest tracker.
Imagine the scene: You’re at a restaurant, presented with a beautiful, glistening slab of beef. "Right," you think, pulling out your tiny, portable food scale. Absurd. Completely impractical, borderline rude. Even at home, meticulously trimming fat before weighing, then re-weighing after cooking, often leads to a "good enough" approximation that frankly, isn't good enough for rigorous dietary science or personalized health goals. We guestimate. We round down. We ignore the tablespoon of butter it was basted in, or the pan drippings we just couldn’t resist. It’s a behavioral bias, sure, but it's enabled by the sheer, unmanageable complexity of accurately quantifying that specific piece of steak. Barcode scanning? Forget it. Unless your cow had a UPC stamped on its flank, it’s useless.
This is precisely where the old methodologies crumble. The manual input, the visual estimations, the endless scrolling through generic database entries – it’s a frustrating, inefficient, and ultimately inaccurate dance. We need better. We need something that cuts through the ambiguity, that sees beyond the mere label "steak" and understands its true, unique profile. Something that can disentangle the fat from the lean, infer the doneness, and even account for the char.
That’s why NutriSnap is more than just an app; it’s a revelation. With its forensic visual analysis, the system learns. It sees the marbling in that ribeye, differentiates it from the leaner sirloin, estimates the doneness, and quantifies the portion. No scales. No guesswork. Just a quick photo, and the complex, variable reality of that steak is instantly analyzed, delivering precision where before there was only hopeful approximation. It's truly transformative for understanding one of humanity's oldest, yet most difficult to track, foods.
Explore More Research
Tired of Manual Tracking?
Stop scanning barcodes and guessing portion sizes. NutriSnap uses forensic AI to track your macros instantly from a single photo.