The Best Sources of Protein: Animal, Plant, and Everything Between

The most common mistake in building a body-composition-focused diet isn't undereating calories. It's undereating protein. The second-most-common mistake is eating the same chicken-broccoli-rice every day until you hate food.

Here's how to build a varied, protein-dense diet using whole foods.

How Much Protein Do You Need?

Quick reference:

• RDA (minimum): 0.8 g per kg of bodyweight
• Active adults: 1.2–1.6 g/kg
• Building muscle: 1.6–2.0 g/kg
• Preserving muscle in a deficit: 1.6–2.2 g/kg
• Adults 65+: at least 1.2 g/kg to counter age-related muscle loss

Run your personal number through the protein calculator to see grams per day and per meal.

Animal Sources: The Protein-Per-Calorie Champions

These foods deliver the most protein per calorie.

Food (100 g cooked)	Protein	Calories
Chicken breast	31 g	165 kcal
Turkey breast	30 g	170 kcal
Tuna (in water)	26 g	130 kcal
White fish (cod, haddock)	22 g	90 kcal
Lean beef (5% fat)	26 g	170 kcal
Pork tenderloin	25 g	140 kcal
Salmon	25 g	210 kcal
Shrimp / prawns	24 g	100 kcal

Best for: fat loss (high protein, moderate-low calories), convenience.

Dairy: Sneaky High-Protein Options

Dairy is often under-rated for protein density.

Food	Protein	Serving
Greek yoghurt (0%)	10 g	100 g
Cottage cheese	11 g	100 g
Skyr	11 g	100 g
Quark	12 g	100 g
Parmesan	35 g	100 g
Whey protein	24 g	1 scoop

Best for: breakfasts, snacks, post-workout.

Eggs: The King of Bioavailability

One large egg = 6 g protein, 72 kcal. The protein is 100% bioavailable. That's the reference standard the food industry uses. Three eggs = 18 g protein for ~220 kcal.

Plant Sources: Not Second-Class, But You Eat More

Plant proteins are usually lower per calorie than animal proteins, and most lack one or two essential amino acids individually. Eating a variety across the day handles this completely.

Food	Protein	Serving
Tofu, firm	12 g	100 g
Tempeh	19 g	100 g
Edamame	11 g	100 g
Seitan	25 g	100 g
Lentils (cooked)	9 g	100 g
Chickpeas (cooked)	9 g	100 g
Black beans	9 g	100 g
Quinoa (cooked)	4 g	100 g
Peanut butter	25 g	100 g
Almonds	21 g	100 g
Pea protein isolate	24 g	1 scoop

Best for: vegetarian/vegan diets, adding fibre (most plant proteins come bundled with fibre).

Practical Meal Builds to Hit 40 g Protein

Each of these gives ~40 g in one meal, a solid anchor for a 120–160 g day.

Option 1 (Animal): 150 g chicken breast (47 g P) + 80 g rice (6 g P) + salad = ~53 g, ~520 kcal Option 2 (Mixed): 2 eggs (12 g) + 200 g Greek yoghurt (20 g) + 40 g oats (5 g) + 30 g almonds (6 g) = ~43 g, ~560 kcal Option 3 (Plant): 200 g firm tofu (24 g) + 100 g quinoa (4 g) + 100 g edamame (11 g) + tahini dressing (3 g) = ~42 g, ~520 kcal Option 4 (Fast): 1 scoop whey (24 g) + 200 g Greek yoghurt (20 g) + berries = ~44 g, ~280 kcal

Three Rules That Make Protein Easier

1. Anchor every meal around a protein source. Decide the protein first, build the rest of the plate around it.
2. Keep a fast protein available. Whey, skyr, a tin of tuna. When the plan falls apart you can still hit 25–30 g in a minute.
3. Don't stack it all at dinner. 30–40 g spread across 3–5 meals beats 150 g in one meal for muscle protein synthesis.

Bottom Line

Animal sources are more efficient per calorie. Plant sources are more fibre-rich and perfectly capable of hitting any target with a little planning. Either way, the trick is variety. Chicken, fish, beef, eggs, dairy, tofu, lentils, nuts, so you never burn out.

Run your personal daily target through the protein calculator and start there.