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Proteins Tier List
Protein is the only category scored on amino-acid quality (DIAAS) — because 20 grams of complete protein and 20 grams of incomplete protein are not the same thing. Liver sits at the top. Nobody is surprised.

Turkey Breast
74The leanest bird here — beats chicken breast on paper.

Sirloin Steak
71The lean steakhouse cut — big flavor, reasonable fat.

Turkey Leg
70Dark meat done right — iron and zinc run higher than breast at a lower price.

Beef Kidney
69A selenium monster — one serving covers multiple days.

Chicken Breast
67The default. Boring, cheap, effective.

Pork Tenderloin
67The 'other white meat' that actually delivers — a thiamin standout.

Venison
67Beef's leaner, wilder cousin — 30g protein at 158 calories.

Beef Heart
66Tastes like steak, priced like offal. The gateway organ.

Rabbit
66Absurdly lean — the lowest-fat mammal protein on this list.

Beef Brisket
64The slow-cooked staple — solid protein with modest micronutrients when trimmed lean.

Pork Chop (Loin)
64Tenderloin's fattier sibling.

Ground Beef 90%
63The weeknight workhorse.

Ribeye Steak
63Marbling tastes great and scores terribly. Worth it anyway — occasionally.

Goat Meat
62Lean game meat — one of the lowest-fat red meats you'll find.

Chicken Drumstick
61Dark-meat economy — cheaper than breast, slightly richer in iron and zinc.

Ground Turkey 93%
61The meal-prep staple.

Bison (Ground)
60Beef's leaner cousin — same playbook, less fat.

Lamb Chop (Loin)
59A zinc and B12 heavyweight in a fatty package.

Chicken Thigh
58Breast's tastier, fattier sibling — more iron and zinc per bite.

Whey Isolate
58The purest protein-per-calorie on this list. Also the most processed.

Lamb Leg
56Red-meat nutrition with a slightly friendlier fat profile than beef.

Duck Breast
55Red-meat iron levels in a bird.

Pea Protein Isolate
48Best of the plant powders — still a step down from whey on protein quality.

Pinto Beans
45The workhorse legume — fiber and folate lead, protein holds up.

Kidney Beans
44The highest measured DIAAS of the common beans — lysine-rich protein.

Lentils
40Folate and fiber for pennies. Protein quality is the weak link.

Pork Belly
39Fat-first calories — 53g fat against 9g protein per 100g; this is flavor, not fuel.

Black Beans
38Magnesium and fiber carry this one.

Peanut Butter
38A fat that markets itself as protein. The niacin is real, though.

Chickpeas
37Hummus's resume looks better than its macros.

Quinoa
34'Complete protein,' technically. 4.4g per 100g, practically.
Questions
How are proteins scored?
Every food is scored 0–100 per 100 calories across five factors (protein, fiber, micronutrients and more depending on the category), combined with fixed weights, then ranked. The top 10% of the board earn S tier. Full methodology.
What is the healthiest protein?
By our numbers: Pork Liver — S tier, 77/100. See its full breakdown.


