Beef Sirloin

Nutrition per ~85 g · a palm-sized piece (~3 oz)

Vitamins

Minerals & other

Bioactives estimated

Representative amounts for this food, not measured for this item. Real content varies widely by variety, ripeness and storage.

What drives the score weighted inputs

These are the scored components, not a sum: the published score also reflects normalisation across the catalog, so the parts above will not add to 82.

Less a 0.5 anti-nutrient penalty.

What it feeds primary sources only

Systems

Pathways

Overview

Beef sirloin has been a dietary staple across cultures for centuries, prized for its balance of protein density and moderate fat content. As a complete protein source, sirloin contains all nine essential amino acids necessary for muscle maintenance, immune function, and tissue repair—increasingly important for healthy aging. The cut is particularly rich in selenium (28.5 mcg per 100g), a cofactor for glutathione peroxidase, a powerful antioxidant enzyme that protects cells from oxidative damage. Sirloin also delivers highly bioavailable heme iron (2.0 mg), which is absorbed 2-3 times more efficiently than non-heme plant iron, supporting oxygen transport and mitochondrial function. The zinc content (5.3 mg) plays crucial roles in immune cell development, protein synthesis, and DNA repair. B vitamins, particularly niacin (8.2 mg) and B12 (1.8 mcg), support energy metabolism and neurological health. For longevity-focused nutrition, lean beef sirloin offers nutrient density without excessive saturated fat, making it a practical choice for maintaining muscle mass and metabolic health during aging.

Health benefits 5

Pairs with

• Pair with leafy greens (spinach, kale) because vitamin C enhances heme iron absorption by 3-4 fold, maximizing bioavailability
• Combine with tomatoes or red peppers because lycopene and vitamin C synergize with beef's selenium and iron for antioxidant effect
• Serve with cruciferous vegetables (broccoli, Brussels sprouts) because glucosinolates and beef's selenium work together to activate Phase II detoxification enzymes
• Pair with mushrooms because ergothioneine (antioxidant) and beef's zinc enhance immune response and reduce inflammation

In the kitchen

• Select grass-fed sirloin when possible; studies show 2-3x higher omega-3 content and improved omega-3:omega-6 ratio compared to grain-fed beef
• Cook at moderate temperatures (160-165°F internal) to preserve heat-sensitive B vitamins while minimizing formation of heterocyclic amines (HCAs); avoid charring
• Store raw sirloin at 32-34°F for up to 3-4 days, or freeze at 0°F for 6-12 months to maintain nutritional quality and food safety
• Consume 100-150g portions (3-5 times weekly) to optimize protein intake without excessive saturated fat; this supports muscle maintenance without overwhelming liver detoxification capacity
• Marinate in antioxidant-rich liquids (red wine, vinegar, herbs) for 30+ minutes before cooking to reduce HCA formation by up to 90%

When to eat it post workout

Post-workout consumption capitalizes on elevated muscle protein synthesis window (up to 48 hours); complete protein profile and high leucine content maximize mTOR activation and amino acid uptake into muscle tissue

Breaks a fast

Also suitable for midday meals to provide sustained satiety and stable energy; can be consumed anytime, but post-workout timing offers physiological advantage for muscle adaptation