Best Protein Sources for Weight Loss: Ranked by Protein Per Calorie

Protein is the most important macronutrient for weight loss. It preserves muscle while you are in a deficit, suppresses hunger more effectively than carbohydrates or fat, and has the highest thermic effect — meaning your body burns more energy digesting it. Getting enough protein is not optional for sustainable fat loss.

But not all protein sources are equal. They differ in protein density, calorie cost, satiety, amino acid completeness, and practicality. This guide ranks the best protein sources for weight loss by what matters most: protein per calorie, satiety, and ease of hitting your daily target.

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How Much Protein Do You Actually Need?

For weight loss specifically, current evidence supports:

• Minimum: 1.2g per kg of bodyweight per day (to preserve muscle in a deficit)
• Optimal: 1.6–2.2g per kg of bodyweight per day (for maximum satiety and muscle preservation)
• Practical target: 0.7–1.0g per pound of bodyweight (same range in imperial)
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For a 75kg (165 lb) person, this means 120–165g of protein per day. That sounds like a lot — and it is, without a deliberate strategy. The food sources below are ranked partly on how efficiently they help you hit that target.

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Tier 1: Highest Protein Density, Lowest Calorie Cost

These sources give you the most protein per calorie. They are the backbone of a weight-loss diet.

1. Chicken Breast

Metric	Per 100g cooked
Protein	31g
Calories	165 cal
Fat	3.6g
Protein per 100 cal	18.8g

The gold standard of lean protein. Low fat, high protein, neutral flavour that works in almost any cuisine. The main risk: overcooking leads to dry, unappetising results that reduce dietary adherence. Use an instant-read thermometer — pull at 74°C (165°F) for juicy results.

2. Turkey Breast (Skinless)

Metric	Per 100g cooked
Protein	30g
Calories	157 cal
Fat	1g
Protein per 100 cal	19.1g

Slightly leaner than chicken breast with very similar nutritional profile. Turkey mince (5% fat) is one of the most versatile high-protein cooking ingredients — works in bolognese, stir-fries, meatballs, and stuffed peppers.

3. Canned Tuna (in Water)

Metric	Per 100g drained
Protein	25g
Calories	109 cal
Fat	0.5g
Protein per 100 cal	22.9g

The highest protein-per-calorie ratio of any common food. Canned tuna in water requires zero cooking, costs under £1 per tin, and provides 25g of protein. The satiety per calorie is exceptional. Note: mercury content means most guidance suggests capping at 3–4 tins per week.

4. Cod and White Fish

Metric	Per 100g cooked
Protein	23g
Calories	105 cal
Fat	0.9g
Protein per 100 cal	21.9g

White fish (cod, haddock, tilapia, pollock) is among the leanest protein sources available. A 200g cod fillet provides 46g of protein for 210 calories. Works well baked, steamed, or pan-fried with minimal oil.

5. Egg Whites

Metric	Per 100g
Protein	11g
Calories	52 cal
Fat	0.2g
Protein per 100 cal	21.2g

Egg whites from a carton are one of the most convenient high-protein, zero-fat ingredients available. 250g (roughly 8 egg whites) provides 27g of protein for 130 calories. Works in scrambles, omelettes, protein pancakes, and added to oats.

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Tier 2: High Protein, Moderate Calories — Excellent for Satiety

6. Non-Fat Greek Yogurt

Metric	Per 100g
Protein	10g
Calories	57 cal
Fat	0.4g
Protein per 100 cal	17.5g

One of the most versatile protein sources for weight loss. A 350g serving delivers 35g of protein for 200 calories. Works as breakfast, snack, or a mayo/sour cream replacement in sauces and dressings. The thick texture contributes to high satiety ratings.

7. Low-Fat Cottage Cheese

Metric	Per 100g
Protein	12g
Calories	84 cal
Fat	2.3g
Protein per 100 cal	14.3g

Underrated protein source. Cottage cheese is high in casein protein — a slow-digesting protein that sustains satiety for longer than whey. Particularly effective as a late-evening meal to prevent overnight hunger. Works sweet (with fruit) or savoury (with herbs and cucumber).

8. Prawns / Shrimp

Metric	Per 100g cooked
Protein	24g
Calories	106 cal
Fat	1.7g
Protein per 100 cal	22.6g

Cook in 3 minutes, require no prep, and have an excellent protein-to-calorie ratio. Frozen prawns are convenient and inexpensive. Work in stir-fries, salads, and pasta dishes. High in iodine and selenium as a bonus.

9. Whole Eggs

Metric	Per 100g (approx 2 large eggs)
Protein	13g
Calories	155 cal
Fat	11g
Protein per 100 cal	8.4g

Lower protein-per-calorie than egg whites due to the yolk's fat content, but whole eggs consistently rank among the most satiating foods per calorie in research. The fat and fat-soluble vitamins in the yolk contribute to sustained fullness. Two eggs plus 150g egg white is a high-satiety, high-protein breakfast combination.

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Tier 3: Complete Plant Proteins — Good Options for Variety

10. Tofu (Firm)

Metric	Per 100g
Protein	17g
Calories	144 cal
Fat	9g
Protein per 100 cal	11.8g

The best plant-based complete protein for weight loss. Firm tofu can be pressed, marinated, and pan-fried or baked to develop texture. Extra-firm tofu has slightly higher protein density. Works in stir-fries, scrambles, and curries.

11. Edamame

Metric	Per 100g shelled, cooked
Protein	11g
Calories	121 cal
Fat	5g
Protein per 100 cal	9.1g

One of the few plant foods that is a complete protein (all essential amino acids present). High in fibre, which amplifies satiety. Works as a snack, in salads, or alongside main meals.

12. Lentils

Metric	Per 100g cooked
Protein	9g
Calories	116 cal
Fat	0.4g
Protein per 100 cal	7.8g

Lower protein density than animal sources, but extremely high in fibre (8g per 100g cooked) — producing exceptional satiety for the calorie count. Lentils are also one of the cheapest protein sources available. Best combined with a higher-protein source to hit daily targets.

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Protein Powder: The Supplement Case

Protein powder is not food — but it is one of the most practical tools for hitting protein targets on a weight loss diet. The case for it:

• Whey protein isolate: ~25g protein per 30g serving, ~110 cal, minimal fat and carbs. Mixes in 30 seconds. Useful when whole-food protein sources are not available or practical.
• Casein protein: Same protein density as whey, but digests slowly. Good for evening use when you want sustained satiety through the night.
• Plant-based blends (pea + rice): Complete amino acid profile when combined, ~20–22g protein per serving. Good alternative for those avoiding dairy.

Protein powder should supplement whole food intake, not replace it. Whole foods provide fibre, micronutrients, and satiety signals that shakes do not replicate. Use powder to bridge gaps, not as a foundation.

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Practical Gram-Weight Targets Per Meal

To hit 150g of protein across three meals, here are the portion sizes you need:

Meal	Source	Weight needed	Protein delivered
Breakfast	Egg whites (carton) + 2 whole eggs	200g whites + 120g eggs	22g + 16g = 38g
Lunch	Chicken breast (cooked)	180g	56g
Dinner	Cod fillet (cooked)	240g	55g
Snack	Non-fat Greek yogurt	100g	10g
Day total			159g protein

These weights are where a food scale earns its place. The difference between 150g and 200g of chicken breast is 16g of protein — easy to miss by eyeball, easily caught by scale. Hitting protein targets precisely is what preserves muscle and drives the hunger-suppression effect of high-protein eating.

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The Protein Source Ranked Summary

Source	Protein/100g	Cal/100g	Protein/100 cal	Tier
Canned tuna (water)	25g	109	22.9g	1
Prawns (cooked)	24g	106	22.6g	1
Cod (cooked)	23g	105	21.9g	1
Egg whites	11g	52	21.2g	1
Turkey breast	30g	157	19.1g	1
Chicken breast	31g	165	18.8g	1
Non-fat Greek yogurt	10g	57	17.5g	2
Tofu (firm)	17g	144	11.8g	3
Low-fat cottage cheese	12g	84	14.3g	2
Edamame	11g	121	9.1g	3
Lentils (cooked)	9g	116	7.8g	3
Whole eggs	13g	155	8.4g	2

For a complete system for hitting protein targets while eating high food volume — including weekly meal structures and shopping lists — the Smart Portion Guide Ebook covers the full framework.

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Related Reading

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