When comparing plain skinless chicken breast against lean top sirloin beef, both cuts provide virtually identical amounts of protein per serving (around 26 grams per 3 oz).
Chicken breast delivers higher protein efficiency with fewer calories and lower fat, while lean beef provides massive advantages in bioavailable heme iron (4.5x higher), zinc (7x higher), and Vitamin B12 (5x higher).
Side-by-Side Macro & Mineral Snapshot (100g Cooked Lean Meat)
Chicken Breast
FDC ID 171534Roasted, skinless meat only (100 g edible portion)
Lean Top Sirloin Steak
FDC ID 170321Broiled, lean only, fat trimmed (100 g edible portion)
"Beef" Is Not One Food: Why Cut Selection Matters
Comparing chicken breast against generic "beef" or "steak" is deeply misleading. Different cuts of beef have radically different nutritional profiles:
- Lean Top Sirloin (Our Default): ~176 kcal, 5.8g fat per 100g (Broiled, trimmed).
- Beef Tenderloin (Filet Mignon): ~217 kcal, 11.8g fat per 100g.
- Ribeye Steak: ~291 kcal, 22.0g fat per 100g.
- 93/7 Ground Beef: ~172 kcal, 7.5g fat per 100g.
- 80/20 Ground Beef: ~254 kcal, 17.0g fat per 100g.
Compare Your Serving Size
Select an equal edible weight and cooking state to compare chicken breast vs lean top sirloin beef:
Chicken Breast (100 g)
Lean Top Sirloin (100 g)
Chicken Breast vs Lean Beef Nutrition per 100g
Complete nutrient profile for 100 grams of cooked edible meat (skinless chicken breast vs lean top sirloin steak, visible fat trimmed) from matched USDA FoodData Central records:
| Nutrient | Chicken Breast (100g) | Lean Top Sirloin (100g) | Difference & Advantage |
|---|---|---|---|
| Calories | 165 kcal | 176 kcal | Chicken is 11 kcal lower (Leaner baseline) |
| Protein | 31 g | 30.6 g | Essentially tied (+0.4 g difference, < 2%) |
| Total Fat | 3.6 g | 5.8 g | Chicken has 2.2 g less fat (-38%) |
| Saturated Fat | 1 g | 2.2 g | Chicken has 1.2 g less saturated fat |
| Carbohydrates | 0.0 g | 0.0 g | 0.0 g (Equal) |
| Cholesterol | 85 mg | 82 mg | Essentially equal (85 mg vs 82 mg) |
| Sodium | 74 mg | 65 mg | Beef is 9 mg lower (Unseasoned plain meat) |
| Potassium | 256 mg | 382 mg | Beef has +126 mg more potassium (+49%) |
| Phosphorus | 228 mg | 231 mg | Essentially equal (228 mg vs 231 mg) |
| Selenium | 27.6 mcg | 35.4 mcg | Beef has +7.8 mcg more selenium |
| Niacin (B3) | 13.7 mg | 7.8 mg | Chicken provides 1.7x more Niacin |
| Vitamin B6 | 0.6 mg | 0.58 mg | Essentially equal (0.60 mg vs 0.58 mg) |
| Vitamin B12 | 0.34 mcg | 1.68 mcg | Beef provides 5x more Vitamin B12 (Major advantage) |
| Iron (Heme) | 0.43 mg | 1.93 mg | Beef provides 4.5x more Iron (Major advantage) |
| Zinc | 0.8 mg | 5.64 mg | Beef provides 7x more Zinc (Major advantage) |
| Choline | 85.3 mg | 114.9 mg | Beef provides +29.6 mg more Choline |
Which Has More Protein: Chicken Breast or Beef?
When comparing equal cooked portions of chicken breast against lean top sirloin steak, they are virtually tied for total protein: 31.0 g vs 30.6 g per 100 grams (or 26 g vs 26 g per 3 oz portion).
Many people mistakenly assume chicken breast contains far more protein than beef. In reality, both are complete animal proteins with rich concentrations of branched-chain amino acids (BCAAs) and essential amino acids. The difference lies in calorie density and micronutrients, not total protein.
Which Gives More Protein per Calorie?
Because chicken breast contains less fat than beef, it delivers a higher concentration of protein per calorie consumed:
Chicken Breast: (31.0 ÷ 165) × 100 = 18.8 g protein per 100 kcal.
Lean Top Sirloin: (30.6 ÷ 176) × 100 = 17.4 g protein per 100 kcal.
To reach 30 grams of protein: you need 97 grams of chicken breast (≈ 160 kcal) versus 98 grams of lean top sirloin (≈ 173 kcal).
Calories and Fat Differences
Chicken breast is lower in fat than lean beef (3.6g vs 5.8g per 100g), and significantly lower than standard beef cuts like ribeye (22g+ fat) or 80/20 ground beef (17g fat). If your objective is maintaining very low daily fat intake, chicken breast provides the cleanest macro ratio.
Iron, Zinc, and Vitamin B12: The Beef Advantage
Lean beef decisively outperforms poultry across three vital micronutrients:
- Heme Iron (1.93 mg vs 0.43 mg): Beef contains 4.5 times more iron in the highly bioavailable heme form, preventing nutritional fatigue and supporting red blood cell formation.
- Zinc (5.64 mg vs 0.80 mg): Beef provides 7 times more zinc, delivering over 50% of the Daily Value per serving to support testosterone synthesis, immune defense, and protein metabolism.
- Vitamin B12 (1.68 mcg vs 0.34 mcg): Beef provides 5 times more B12 (cobalamin), essential for neurological function and DNA synthesis.
Niacin, Vitamin B6, and Selenium Profiles
Chicken breast holds a clear advantage in Niacin / Vitamin B3 (13.7 mg vs 7.8 mg), which aids cellular energy metabolism, while both foods provide similar high amounts of Vitamin B6 (~0.60 mg) and Selenium (~28 to 35 mcg).
Ground Beef, Fatty Steaks, and Processed Meats
Do not compare plain grilled chicken breast with processed cured meats (beef jerky, sausages, corned beef) or fatty steaks without adjusting for added sodium and saturated fat.
If using ground beef, select 93/7 or 96/4 extra-lean blends to keep calories and fat comparable to whole poultry cuts.
Chicken Breast or Beef: Which Should You Choose?
Choose Chicken Breast If:
- You want maximum protein per calorie for strict cutting or weight loss.
- You are keeping total dietary fat and saturated fat to a minimum.
- You need high Niacin (B3) density.
- You prefer an affordable, neutral protein base for high-volume meals.
Choose Lean Beef If:
- You want substantial bioavailable heme iron and zinc from whole food.
- You need high Vitamin B12 intake for energy and recovery.
- You enjoy rich, savory umami flavors and steakhouse texture.
- You want natural dietary creatine and choline alongside complete protein.
How We Compare Chicken and Beef
Both foods are evaluated using verified USDA FoodData Central SR Legacy records (FDC ID 171534 for chicken breast, FDC ID 170321 / NDB 13454 for lean top sirloin steak) matching cooked state, lean-only preparation, and 100g edible portion weights.
Frequently Asked Questions
Which has more protein, chicken breast or beef?
It depends on the beef cut. When comparing plain grilled chicken breast with cooked lean top sirloin steak, both provide approximately 26 grams of protein per 3-ounce serving, resulting in a virtual tie for absolute protein content.
Which has fewer calories?
Chicken breast provides fewer calories. In a standard 3-ounce serving, grilled chicken breast has roughly 128 calories compared to 150 calories for lean top sirloin (or 165 kcal vs 176 kcal per 100 g).
Which has less fat?
Chicken breast is leaner: approximately 2.7 g to 3.6 g total fat per portion compared to 4.9 g to 5.8 g for lean top sirloin steak with visible fat trimmed.
Which has more iron?
Lean beef provides substantially more iron (approx 1.93 mg vs 0.43 mg per 100 g), primarily in the highly bioavailable heme iron form that supports oxygen transport and red blood cell production.
Which has more zinc?
Lean beef provides over 5 to 7 times more zinc (approx 5.64 mg vs 0.80 mg per 100 g), providing over 50% of the Daily Value in a single serving for immune support.
Which has more vitamin B12?
Beef has a massive advantage in Vitamin B12, supplying approximately 1.68 mcg per 100 g (approx 70% DV) compared to 0.34 mcg in chicken breast.
Which provides more protein per calorie?
Chicken breast provides more protein per calorie: approximately 18.8 g to 20.3 g protein per 100 calories compared to 17.3 g per 100 calories for lean top sirloin.
Is chicken always leaner than beef?
No. Beef nutrition varies drastically by cut. Very lean cuts like top sirloin, eye of round, or 96/4 ground beef are very low in fat, while cuts like ribeye or 80/20 ground beef contain significantly more fat and calories.
Is ground beef the same as steak nutritionally?
No. Ground beef must be evaluated by its exact lean-to-fat ratio (e.g. 93/7 vs 80/20). A fatty ground beef blend contains more than double the calories and fat of lean top sirloin.
Is beef unhealthy because it is red meat?
Fresh lean beef is an exceptional, nutrient-dense whole food rich in protein, iron, zinc, and B12. Overall health outcomes depend on total dietary patterns, portion size, and avoiding heavily processed cured meats.
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