Chicken vs. Fish Dynamic Nutrient Matrix
Calibrate portions, select poultry cuts or marine species, and benchmark calories, protein density, and trace minerals side-by-side.
Nutritional Breakdown (100g, Chicken Breast vs. White Fish (Cod & Tilapia))
Focus: Lean Protein Logging · Estimates anchored to USDA FoodData Central
| Nutrient Metric | Chicken (Chicken Breast) | Fish (White Fish (Cod & Tilapia)) | Difference | Advantage | Logging Context |
|---|---|---|---|---|---|
| Energy / Calories (kcal) | 165 | 105 | 57% | Fish | White fish like cod lists only 105 kcal per 100g (<1g fat)—36% lower in calories than chicken breast. |
| Complete Protein Density (g) | 31 | 22.8 | 36% | Chicken | Chicken breast provides ~31g protein per 100g (75% calories from protein); cod provides ~23g; tuna provides ~29.2g. |
| Total Dietary Fat (g) | 3.6 | 0.9 | 300% | Fish | Cod and tuna are virtually fat-free (<0.9g fat per 100g), creating a near-zero fat protein source. |
| Saturated Fatty Acids (g) | 1 | 0.2 | 400% | Fish | White fish contains merely 0.2g saturated fat per 100g compared to 1.0g in roasted chicken breast. |
| Monounsaturated Fat (MUFA) (g) | 1.2 | 0.1 | 1100% | Fish | Lean white fish carries virtually zero monounsaturated fat (0.1g per 100g). |
| Polyunsaturated Fat (PUFA) (g) | 0.8 | 0.3 | 167% | Fish | Fish PUFA consists predominantly of active long-chain marine omega-3s (EPA and DHA). |
| Marine Omega-3 (EPA + DHA) (mg) | 35 | 195 | +457% | Fish | Even lean white fish supplies 150–465 mg EPA+DHA per 100g; chicken contains negligible marine omega-3s (~35 mg). |
| Dietary Cholesterol (mg) | 85 | 55 | -35% | Fish | White fish carries only 47–55 mg cholesterol per 100g compared to 85 mg in skinless chicken breast. |
| Marine Iodine (mcg) | 14 | 110 | +685% | Fish | Cod supplies 110 mcg iodine per 100 g (73% DV); chicken breast lists 14 mcg — a major split for iodine logging. |
| Selenium (Antioxidant Trace Mineral) (mcg) | 24 | 43 | +79% | Fish | Marine fish leads animal foods in selenium: tuna delivers 108 mcg (196% DV); cod delivers 43 mcg; chicken 24 mcg. |
| Active Vitamin D3 (IU) | 6 | 46 | +667% | Fish | Pacific halibut and cod supply 46–190 IU vitamin D3 per 100g; chicken logs trace amounts (<10 IU). |
| Vitamin B12 (Cobalamin) (mcg) | 0.3 | 1.2 | +300% | Fish | Finfish lists 1.2–2.2 mcg B12 per 100g (50–92% DV) compared to 0.3 mcg in chicken breast. |
| Niacin (Vitamin B3) (mg) | 13.7 | 2.5 | -82% | Chicken | Chicken breast provides 13.7mg niacin (86% DV)—crucial for cellular NAD+ glycolysis; cod provides 2.5mg. |
| Estimated Cost per 30g Protein ($) | 0.9 | 2.6 | -65% | Chicken | Chicken breast costs ~$0.90 per 30g protein versus $2.60–$4.20 for fresh fish—saving over $150 monthly. |
Protein Density, Caloric Ceilings & Leanness
The Extreme Leanness of White Fish: Atlantic cod logs 105 kcal and 22.8 g protein per 100 g, yielding 21.7 g protein per 100 kcal. Yellowfin tuna logs 130 kcal and 29.2 g protein (22.5 g/100 kcal). Chicken breast logs 18.8 g/100 kcal.
Calorie-Efficient Protein: Atlantic cod lists ~105 kcal per 100 g — about 50 g protein from cod totals ~230 kcal vs ~270 kcal for the same protein from chicken breast on USDA averages.
Leucine per Portion: Chicken breast provides ~2.56 g leucine per 100 g. White fish provides ~1.85–2.10 g leucine per 100 g. A 150 g fillet of either supplies a substantial leucine portion for logging.
Complete Amino Acid Profiles: Both poultry and marine finfish provide DIAAS scores >1.15 with 100% digestibility and all 9 essential amino acids in optimal proportion.
Caloric Ceilings, Marine Trace Minerals & Lipid Partitioning
Chicken breast and finfish represent two of the leanest whole-food proteins on Earth. White fish pushes caloric ceilings to an absolute minimum with under 1 g of fat, while chicken breast offers superior leucine mass, grocery affordability, and multi-day meal prep stability.
Caloric Ceiling per 100g
White fish like cod has virtually zero intramuscular fat (<1g), delivering 36% fewer calories per 100g than chicken breast.
Protein-to-Calorie Ratio
White fish and tuna exceed skinless chicken breast in protein per calorie on USDA averages — useful when your log has a tight calorie ceiling.
Marine Trace Selenium & Iodine
Marine finfish concentrate seawater trace minerals — cod and tuna list substantially higher selenium and iodine per 100 g than chicken breast in USDA tables.
Meal Prep Stability & Reheating
Cooked chicken reheats stably in office microwaves; fish oxidizes delicate lipids rapidly, producing strong volatile amine odors.
1. The Extreme Leanness of White Fish
Atlantic cod, tilapia, and haddock contain less than 1.0 g total fat per 100 g cooked. White fish lists ~105 kcal per 100 g — about 60 kcal less per 100 g serving than roasted skinless chicken breast on USDA averages.
2. Marine Iodine & Selenium
Cod delivers 110 mcg iodine (73% DV) and yellowfin tuna lists up to 108 mcg selenium per 100 g. Chicken breast supplies 14 mcg iodine and 24 mcg selenium — a clear split for trace-mineral logging.
3. Zero Heavy Metals & Prep Stability
Unlike pelagic predatory fish that accumulate methylmercury up the marine food chain, chicken breast carries zero mercury limits. Chicken also lacks trimethylamine oxide (TMAO), allowing multi-day batch cooking without fishy microwave oxidation.
Whole-Food Benchmark: Chicken vs. Fish
Side-by-side USDA-backed estimates comparing roasted chicken breast against Atlantic cod, tilapia, and yellowfin tuna for food logging and dietary calibration.
| Parameter | Chicken Breast (Skinless) | Finfish (Cod / Tuna) | Logging Verdict |
|---|---|---|---|
| Protein-to-Calorie Ratio | 18.8 g protein per 100 kcal (~75% of calories from protein) | 21.7 g protein per 100 kcal in cod; 22.5 g in yellowfin tuna | White fish and tuna are the absolute purest protein per calorie |
| Total Dietary Fat | ~3.6 g per 100 g (lean white poultry muscle) | ~0.6–0.9 g per 100 g in cod, haddock, and yellowfin tuna | White fish is virtually fat-free; ideal for zero-fat macro budgets |
| Marine Omega-3 (EPA + DHA) | Trace: ~20–40 mg per 100 g | ~200–465 mg in lean fish; up to 2,200 mg in oily fish (salmon/mackerel) | Fish provides essential marine EPA/DHA; chicken provides trace amounts |
| Iodine Density | Low (~14 mcg per 100 g, 9% Daily Value) | High (~85–110 mcg per 100 g, 60–73% Daily Value in cod) | Marine whitefish is among the top whole-food iodine sources in USDA tables |
| Heavy Metal & Methylmercury Context | Zero bioaccumulative methylmercury; safe for unlimited consumption | Cod/Tilapia low; Yellowfin Tuna moderate (limit large pelagic fish to 2–3x/wk) | Chicken eliminates all seafood advisory frequency constraints |
| Grocery Cost per 30 g Protein | $0.80–$1.05 (boneless breast at $3.49–$4.49/lb) | $2.50–$4.50 (fresh cod, halibut, or tuna fillets at $10–$20/lb) | Chicken is 2.5× to 4× cheaper per unit of complete dietary protein |
| Meal Prep Longevity & Aroma | 4–5 days refrigerated; stable texture and pleasant neutral aroma | 1–2 days max; reheating in shared microwaves generates trimethylamine | Chicken is dramatically superior for multi-day batch cooking |
| Culinary Thermal Forgiveness | Forgiving window between 155°F–165°F; handles braising and grilling | Very delicate myofibrils; dries out and weeps albumin above 145°F | Chicken is far easier for home cooks to prepare without drying out |
1. Caloric Deficit Ceiling
With ~0.9 g fat per 100 g, Atlantic cod allows hitting 50 g protein for only 230 total calories—making it the ultimate tool for rapid fat loss and contest cuts.
2. Marine Iodine & Selenium
Cod and tuna supply up to 110 mcg iodine and 108 mcg selenium per 100 g — trace-mineral columns that terrestrial poultry rows do not match.
3. Grocery Economics & Storage
Chicken breast at ~$0.90 per 30 g protein vs fresh fish at ~$2.60–$4.20 suits multi-day meal prep. Cooked chicken keeps 4–5 days; fish is best within 24–48 hours.
Marine Iodine, Selenium & Trace Minerals
Beyond macronutrient percentages, finfish and poultry diverge dramatically in trace elements synthesized in ocean biospheres versus terrestrial agriculture.
Marine Iodine (110 mcg / 100 g)
Atlantic cod supplies 110 mcg iodine per 100 g (73% DV), among the richest iodine columns in USDA whole-food tables. Chicken breast supplies 14 mcg (9% DV). Log cod or other finfish when iodine is a nutrient you track.
Selenium (Up to 108 mcg / 100 g)
Yellowfin tuna lists 108 mcg selenium per 100 g (196% DV); cod supplies 43 mcg; chicken breast supplies 24 mcg. Selenium is an essential trace mineral — marine finfish concentrate it more than land poultry in USDA averages.
Niacin (B3) & Vitamin B6
Chicken breast dominates niacin at 13.7 mg per 100 g (86% DV) compared to 2.5 mg in Atlantic cod. Niacin serves as the vital molecular precursor for NAD+/NADH cellular ATP energy cycles. Chicken also supplies 0.6 mg vitamin B6 (35% DV) for rapid muscle amino acid assimilation.
The Culinary Masterclass: Cooking, Flavor & Meal Prep
Master the thermal secrets to cook flaky, tender white fish without weeping moisture, sear juicy chicken breast to perfection, and store both safely for weekly meal prep.
The 145°F Fish Delicacy Window
Marine finfish muscles have short fiber bundles (myotomes) separated by delicate connective collagen (myocommata). Overcooking past 145°F causes the protein matrix to contract abruptly, expelling intracellular moisture and weeping white coagulated albumin. Pull white fish from the heat at 135°F to 140°F (57°C) to let carryover heat achieve a delicate, buttery flake.
The Chicken Dry-Brine Juiciness Secret
Unlike fish, chicken breast contains denser myofibrils that require thermal pasteurization. Dry-brine breasts with 1% kosher salt for 30 minutes before cooking to dissolve surface actomyosin and expand cellular hydration capacity. Pan-sear on medium heat until internal temperature reaches 155°F (held for 50 seconds per USDA FSIS) for exceptional tenderness.
The Microwave TMA Reheating Reality
Marine fish contains trimethylamine oxide (TMAO) that degrades into volatile trimethylamine (TMA) during refrigeration. Reheating fish in an office microwave aerosolizes TMA, creating pungent fish aromas. Cooked chicken breast lacks TMAO, preserving a neutral, clean aroma and firm texture for 4 to 5 days in airtight glass containers.
The 5:2 High-Performance Rotation
A practical 5:2 logging split: batch-cook chicken breast or thighs for 5 weekday lunches (lower cost, ~$0.90 per 30 g protein serving), and log fresh fish fillets (cod, halibut, or salmon) 2 evenings weekly to capture marine iodine, selenium, and EPA/DHA columns.
The Bottom Line: When Chicken Wins vs. When Fish Wins
Both food sources deliver exceptional protein efficiency. Use this decision matrix to pick the right entry for your caloric limits, microwave logistics, and micronutrient goals.
When Chicken Breast Fits Your Log Best
- Dramatically Cheaper: At ~$0.90 per 30 g protein serving, chicken breast is 2.5× to 4× more cost-effective than fresh cod, halibut, or tuna.
- Office Microwave Friendly: Reheats with neutral aromas without aerosolizing pungent fishy trimethylamines (TMA).
- 5-Day Meal Prep Durability: Cooked chicken breast keeps safely for 4–5 days in glass containers without protein weeping or textural degradation.
- Zero Mercury Limits: Can be consumed daily without monitoring trophic-level methylmercury bioaccumulation or fish advisories.
- Higher Niacin (B3): Delivers 13.7 mg niacin per 100 g (86% DV)—5× more than Atlantic cod—fueling cellular ATP glycolysis.
When White Fish & Tuna Fit Your Log Best
- Lowest Caloric Ceiling: Atlantic cod provides pure protein at only 105 kcal per 100 g (<1 g fat)—saving ~60 kcal per serving vs chicken breast.
- Marine Iodine Density: Supplies 110 mcg iodine per 100 g (73% DV) — among the highest iodine columns in USDA whole-food tables.
- Selenium Content: Yellowfin tuna lists 108 mcg selenium (196% DV) vs 24 mcg in chicken breast — a clear split for trace-mineral logging.
- Active Marine Omega-3s: Supplies 150–465 mg EPA and DHA per 100 g, even in ultra-lean species; chicken supplies trace amounts.
- Gentle Gastrointestinal Digestion: Fine myotome muscle fibers break down rapidly in the stomach with minimal digestive fatigue.
Frequently Asked Questions: Chicken vs. Fish
Evidence-based answers regarding caloric ceilings, mercury risk, marine omega-3 intake, meal prep reheating, and grocery economics.
White fish (such as Atlantic cod, haddock, and tilapia) is significantly lower in calories than chicken breast. Atlantic cod lists ~105 calories and ~0.9 g fat per 100 g cooked, compared to ~165 calories and ~3.6 g fat for roasted skinless chicken breast. Cod delivers ~36% fewer calories per 100 g of whole food.
Scientific Citations & USDA FoodData Central Records
Nutrient estimates, trace minerals, and contaminant classifications are anchored to peer-reviewed studies and official FDA/USDA records below.
Advice about Eating Fish: For Those Who Might Become or Are Pregnant or Breastfeeding and Children Ages 1–11
U.S. Food and Drug Administration & Environmental Protection Agency
FDA-2021-N-0610
Key finding: Classifies commercial fish species into Best, Good, and Choices to Avoid based on methylmercury concentrations, validating cod and tilapia as low-mercury options.
The importance of selenium in human health
Rayman, M. P.
DOI: 10.1016/S0140-6736(00)02490-9
Key finding: Reviews dietary selenium as an essential trace mineral and notes marine finfish as concentrated sources in food-composition tables.
Fish intake, contaminants, and human health: evaluating the risks and the benefits
Mozaffarian, D., & Rimm, E. B.
DOI: 10.1001/jama.296.15.1885
Key finding: Weighs marine omega-3 intake and contaminant exposure from fish against benefits — background for comparing fish and poultry in meal planning.
Dietary selenium’s protective role against methylmercury toxicity
Ralston, N. V., & Raymond, L. J.
DOI: 10.1016/j.tox.2010.06.004
Key finding: Discusses selenium-to-mercury molar ratios in marine fish species — context for FDA/EPA seafood frequency guidance.
Chicken, broilers or fryers, breast, meat only, cooked, roasted
U.S. Department of Agriculture, ARS
FDC 171477
Key finding: SR Legacy reference profile for roasted skinless chicken breast: 165 kcal, 31.0 g protein, 3.6 g fat, 85 mg cholesterol, 24 mcg selenium per 100 g.
Fish, cod, Atlantic, cooked, dry heat
U.S. Department of Agriculture, ARS
FDC 174184
Key finding: SR Legacy reference profile for Atlantic cod: 105 kcal, 22.8 g protein, 0.9 g fat, 55 mg cholesterol, 43 mcg selenium, 110 mcg iodine per 100 g.
Fish, tuna, fresh, yellowfin, cooked, dry heat
U.S. Department of Agriculture, ARS
FDC 173708
Key finding: Yellowfin tuna reference: 130 kcal, 29.2 g protein, 0.6 g fat, 108 mcg selenium per 100 g.
Fish, halibut, Atlantic and Pacific, cooked, dry heat
U.S. Department of Agriculture, ARS
FDC 174201
Key finding: Pacific halibut reference: 140 kcal, 26.7 g protein, 2.9 g fat, 190 IU vitamin D, 465 mg combined EPA+DHA proxy per 100 g.
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Informational tool only
This page is for personal nutrition journaling and awareness only — not medical or dietary advice. I am not a doctor. Nutrient values are derived from USDA FoodData Central and FDA/EPA seafood advisory catalogs. Actual composition varies by wild vs farmed origin, harvest season, and cooking method. Full source links are in the References section below.