rationTracker

Best Foods for Building Muscle: Protein, Leucine, and Calories

The protein density and leucine content behind muscle growth, ranked from measured data.

Written by Ration Editorial Team · Updated July 19, 2026

Key takeaways

  • Total daily protein around 1.6 g per kg of body weight maximizes muscle gain in most people.
  • Leucine is the amino acid that triggers muscle protein synthesis; animal proteins are richest.
  • A modest calorie surplus supports growth alongside training.

How much protein

A meta-analysis found protein intakes up to about 1.6 grams per kilogram of body weight per day increased muscle and strength gains from resistance training, with little added benefit beyond that.[1] Spreading protein across meals helps.

These foods carry the most protein per 100 grams:

Protein, g per 100 grams
  1. 1Steelhead Trout Flesh (Shoshone Bannock)77.3 g / 100 g
  2. 2Vital Wheat Gluten75.2 g / 100 g
  3. 3Salmon Red (Sockeye)60.6 g / 100 g
  4. 4Caribou Shoulder Meat59.4 g / 100 g
  5. 5Egg Substitute Powder55.5 g / 100 g
  6. 6Peanut Flour Defatted52.2 g / 100 g
  7. 7Caribou Rump Meat52.1 g / 100 g
  8. 8Soy Flour Defatted51.5 g / 100 g
  9. 9Soy Flour Low-Fat49.8 g / 100 g
  10. 10Seeds Cottonseed Meal49.1 g / 100 g
  11. 11Egg Stabilized48.2 g / 100 g
  12. 12Seeds Sunflower Seed Flour48.1 g / 100 g
Ranked by protein per 100 grams (so dense, dry foods like flours rank high). Computed live from the Ration database.

Leucine matters

Leucine is the branched-chain amino acid that switches on muscle protein synthesis after a meal; roughly 2 to 3 grams per meal is a common target.[2] Animal proteins are the densest sources.

Leucine, g per 100 grams
  1. 1Egg Stabilized4.23 g / 100 g
  2. 2Soy Flour Defatted3.83 g / 100 g
  3. 3Flour Soy3.59 g / 100 g
  4. 4Seeds Sunflower Seed Flour3.5 g / 100 g
  5. 5Peanut Flour Defatted3.38 g / 100 g
  6. 6Seeds Cottonseed Meal3.35 g / 100 g
  7. 7Cheese Parmesan3.3 g / 100 g
  8. 8Seeds Sesame Flour3.1 g / 100 g
  9. 9Seeds Cottonseed Flour3.1 g / 100 g
  10. 10Cheese Gruyere3.1 g / 100 g
Ranked by leucine per 100 grams (so dense, dry foods like flours rank high). Computed live from the Ration database.

Eat enough total energy

Muscle growth is easier in a small calorie surplus. Pair the protein above with enough total food to support training and recovery.

Very high protein intakes may also affect cellular recycling processes like autophagy, the body's system for clearing out damaged proteins, which plays a role in muscle and heart tissue upkeep.[3] Some researchers also caution that extreme protein or supplement claims deserve scrutiny, since not all marketed benefits hold up to evidence.[4] Gut health matters too, since intestinal permeability, sometimes called a leaky gut, can influence how well nutrients like protein are absorbed and how the body responds to inflammation from training.[5]

Bottom line

Hit your daily protein target with leucine-rich foods spread across meals, train progressively, and keep energy adequate. Rank any food by protein or leucine in the spreadsheet.

Sources

  1. Morton RW et al. A systematic review of protein supplementation and resistance training. Br J Sports Med. 2018. · PMID 28698222
  2. Witard OC et al. Myofibrillar muscle protein synthesis rates after protein ingestion. Am J Clin Nutr. 2014. · PMID 24257722
  3. Too much or not enough of a good thing--The Janus faces of autophagy in cardiac fuel and protein homeostasis · PMID 25771142
  4. Too Good to be True? · PMID 33781437
  5. All disease begins in the (leaky) gut: role of zonulin-mediated gut permeability in the pathogenesis of some chronic inflammatory diseases · PMID 32051759