Gram for gram, protein is the most filling thing you can eat — it slows digestion, blunts the hunger hormone ghrelin, and bumps up the fullness signals your gut sends to your brain harder than carbs or fat manage to. That's not a supplement company talking point, that's just how your gut hormones work.
Translation for anyone in a calorie deficit: swapping some carbs or fat for extra protein is one of the easiest ways to feel less hungry on fewer calories.
Cutting calories without cutting muscle
Any decent-sized calorie deficit puts muscle at risk — your body doesn't automatically know to burn fat and leave muscle alone. A higher protein intake during a deficit consistently protects lean mass better than a standard or low-protein approach at the same calorie level, especially paired with resistance training.
Figures illustrate the typical direction and scale of the effect seen across body composition research — individual results vary with training status, starting body composition, and deficit size.
One massive feed doesn't beat three solid ones
Your muscles can only respond to so much protein at once — there's a threshold (roughly 20–40g of good-quality protein) that needs crossing to properly switch on muscle building. Extra protein in that sitting mostly just gets used for energy or excreted, not extra gains.
That means 10g at breakfast, 15g at lunch, and 70g at dinner switches the "build muscle" signal on properly once — maybe twice. Spread the same total protein evenly across three or four meals, and you switch it on three or four times a day instead.
The practical bit: if breakfast is where your protein always falls short — toast and coffee, nothing else — that's usually the easiest single fix. Eggs, Greek yoghurt, or a protein shake closes the gap fast.
Protein isn't just for muscle
Tendons and ligaments are basically rope made of collagen, rebuilt constantly under training load — far more slowly than muscle. Most everyday protein sources aren't great raw material for that specific job; collagen is unusually rich in glycine and proline, which most people don't get much of from a normal diet.
The protocol with real evidence behind it
~30–60min pre-loading: 15–20g collagen/gelatin + ~50mg vitamin C
A controlled trial found vitamin C-enriched gelatin taken roughly an hour before exercise doubled a key marker of collagen synthesis compared to placebo. Keep it in perspective: real but modest effect, an add-on for tendon-loading days or heavy training blocks — not a replacement for hitting your normal daily protein target from whole foods.
How much, and when
| Food | Protein |
|---|---|
| Chicken breast, 150g | ≈ 35g |
| 2 eggs | ≈ 13g |
| Greek yoghurt, 200g | ≈ 20g |
| Whey scoop | ≈ 24g |
| Tofu, 150g | ≈ 18g |
| Tin of tuna | ≈ 25g |
| Gelatin/collagen + vit C, pre-loading | ≈ 15–20g |
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