Why Protein Matters
Protein is the most satiating macronutrient — it keeps you fuller for longer, reduces overall calorie intake, and preserves lean muscle mass during weight loss. It also has the highest thermic effect of food: your body burns 20–30% of protein calories just digesting it, compared to only 3–8% for carbohydrates and fat.
0.8g
Minimum protein per kg/day (UK RDA — the bare minimum, not optimal)
1.6–2.2g
Optimal range per kg/day for active adults and those building muscle
30%
of protein calories are burned during digestion (thermic effect)
Top 15 Animal Protein Sources
| Food | Protein per 100g | Calories per 100g | Notes |
|---|---|---|---|
| Chicken breast (grilled) | 31g | 165 | Lean, versatile, affordable |
| Canned tuna (in water) | 26g | 109 | Best protein-per-penny ratio |
| Turkey breast | 29g | 135 | Leaner than chicken |
| Salmon (cooked) | 25g | 208 | High omega-3, excellent overall |
| Lean beef mince (5% fat) | 26g | 175 | Iron-rich, muscle-building |
| Prawns/shrimp | 24g | 99 | Very low calorie, high protein |
| Cod (cooked) | 23g | 105 | Lean white fish |
| Eggs (large) | 13g | 155 | Complete amino acid profile |
| Greek yoghurt (0% fat) | 17g | 97 | Gut-friendly, high casein |
| Cottage cheese | 11g | 98 | Slow-release protein (casein) |
| Parmesan cheese | 38g | 431 | Highest protein of all cheeses |
| Sardines (canned) | 22g | 208 | Budget-friendly, omega-3 rich |
| Pork tenderloin | 26g | 143 | Leanest cut of pork |
| Whey protein powder | 70–80g | 350–400 | Supplement, not whole food |
| Lamb (lean, cooked) | 25g | 218 | Iron and zinc-rich |
Top 15 Plant Protein Sources
| Food | Protein per 100g | Calories per 100g | Notes |
|---|---|---|---|
| Seitan (wheat gluten) | 25g | 370 | Highest plant protein by weight |
| Tempeh | 19g | 193 | Fermented soy, gut-friendly |
| Edamame (cooked) | 11g | 121 | Complete protein, great snack |
| Lentils (cooked) | 9g | 116 | Affordable, high fibre |
| Black beans (cooked) | 9g | 132 | Combine with rice for complete protein |
| Chickpeas (cooked) | 9g | 164 | Versatile, hummus base |
| Hemp seeds | 31g | 553 | Complete protein, omega-3 rich |
| Pumpkin seeds | 30g | 559 | High in zinc, complete amino acids |
| Quinoa (cooked) | 4g | 120 | Only complete plant grain protein |
| Tofu (firm) | 8–15g | 76 | Protein varies by firmness |
| Peanut butter | 25g | 588 | Calorie-dense, watch portions |
| Nutritional yeast | 50g | 325 | Complete protein, B12 source |
| Almonds | 21g | 579 | Good fats + protein combo |
| Oats (dry) | 17g | 389 | Best grain protein source |
| Green peas (frozen) | 5g | 81 | Inexpensive, high leucine |
ℹ️ Complete vs Incomplete Protein
Complete proteins contain all 9 essential amino acids (all animal proteins + quinoa, soy, hemp, buckwheat). Incomplete proteins lack one or more. On a plant-based diet, eat varied protein sources throughout the day — you don't need to combine them at every meal, just across the day. Classic complete combinations: rice + beans, hummus + pita, peanut butter + oats.
Frequently Asked Questions
How much protein can the body absorb per meal?▼
Research suggests the body can utilise approximately 20–40g of protein per meal for muscle protein synthesis. Higher amounts aren't wasted — they're used for other functions or oxidised — but 40g per sitting is generally considered a practical upper limit for muscle-building purposes. This is why spreading protein intake across 4–5 meals is recommended.
Is plant protein as good as animal protein for building muscle?▼
Plant proteins are generally lower in leucine — the key amino acid that triggers muscle protein synthesis. However, by eating higher quantities and combining sources, vegans can build muscle effectively. Studies show comparable muscle gain when total protein and leucine intake are matched between animal and plant-based diets.
What is the best time to eat protein?▼
Protein consumed within 2 hours after resistance training maximally stimulates muscle repair and growth. A high-protein breakfast also suppresses appetite throughout the day. Casein protein (from dairy) before bed provides slow-release amino acids during overnight recovery.
Related Health Guides
⚕️ Medical Disclaimer: This article is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making changes to your health routine or diet.