How Much Protein Do You Need When Dieting?

Why Protein Is So Important When Dieting

Three mechanisms make protein uniquely valuable during a calorie deficit. First, muscle preservation: in a calorie deficit, your body can use both fat and muscle tissue for energy. High protein intake signals the body to preserve muscle, directing fat to be broken down preferentially. Second, satiety: protein is the most filling macronutrient — it suppresses the hunger hormones ghrelin more effectively than carbohydrates or fat, making it easier to eat less without feeling deprived. Third, the thermic effect: your body burns 25–30% of protein calories just digesting it, compared to 6–8% for carbohydrates and 2–3% for fat. This effectively means dietary protein has fewer usable calories than its label suggests.

The Research-Backed Protein Targets

For active people dieting while trying to preserve muscle mass, many sports-nutrition plans use about 1.6–2.2 g of protein per kilogram of bodyweight per day. The higher end is most relevant for people who do resistance training — lifting weights or performing bodyweight exercises regularly — while general health protein needs are lower.

For a 70 kg woman dieting at 1,800 calories per day: 1.6 g/kg = 112 g protein per day (minimum); 2.2 g/kg = 154 g protein per day (optimal). For a 90 kg man dieting at 2,200 calories per day: 1.6 g/kg = 144 g protein; 2.2 g/kg = 198 g protein. These ranges may seem high if you are used to general health recommendations (which are lower), but they are specifically designed for body recomposition — not just survival.

Is It Possible To Eat Too Much Protein?

For people without kidney disease, higher-protein diets are not usually treated as a kidney-safety concern, but that does not make very high intakes automatically better. People with kidney disease, reduced kidney function, diabetes, pregnancy, eating-disorder history, or clinical dietary needs should get individual advice before increasing protein.

A sensible planning ceiling for most readers is the lowest intake that supports satiety and training, often around 1.6–2.2 g per kilogram rather than pushing above it. Above that level, additional protein often displaces carbohydrates, fats and fibre-rich foods without adding much practical value.

How To Hit Your Protein Target: UK Food Examples

A practical daily structure for a 70 kg woman targeting 140 g protein at 1,800 kcal:

• Breakfast: 200 g 0% Greek yogurt + 50 g oats + 100 ml skimmed milk = ~25 g protein, ~320 kcal.
• Lunch: 1 tin tuna in spring water + large salad + 1 tbsp olive oil = ~28 g protein, ~320 kcal.
• Dinner: 180 g grilled chicken breast + 80 g brown rice (dry weight) + 150 g broccoli = ~60 g protein, ~580 kcal.
• Snack: 200 g cottage cheese + cherry tomatoes = ~24 g protein, ~190 kcal.
• Total: ~137 g protein, ~1,410 kcal — leaving 390 kcal for additional carbs, fats, or a second snack.
• Adding 2 boiled eggs at any point adds 13 g protein for ~160 kcal — a simple way to bridge any remaining gap.

Protein Timing: Does It Matter?

Spreading protein across the day rather than eating most of it in one sitting is the widely used practical approach: aim for roughly 30–50 g per meal across 3–4 eating occasions. Total daily protein matters more than precise timing, so treat a protein-containing meal near training as useful rather than essential.

The anabolic window (the idea that you must eat protein immediately post-workout or lose all gains) is largely overstated. What matters most is total daily protein intake — not timing. If you eat enough protein across the day, the exact timing is a minor detail.

The Best Protein Sources For Dieting In The UK

The most effective protein sources for dieting share two qualities: they are high in protein relative to calories, and they are filling. The best choices available in UK supermarkets include chicken breast (31 g protein per 100 g, ~165 kcal), tinned tuna in spring water (25 g per 100 g, ~100 kcal), 0% Greek yogurt (10 g per 100 g, ~57 kcal), cottage cheese (12 g per 100 g, ~80 kcal), egg whites (11 g per 100 g, ~50 kcal), and cooked prawns (20 g per 100 g, ~90 kcal).

Use our free meal plan generator to create a complete high-protein week with calculated protein per meal. You can specify your supermarket, calorie target, and the generator automatically distributes protein across all meals.