Cutting Diet Plan: How to Lose Fat While Keeping Your Muscle

A cutting phase is a strategic period of fat loss — eating at a calorie deficit with high protein and continued training to lose fat while keeping the muscle you've built. Done correctly, you end a cut leaner and looking more defined. Done wrong, you lose as much muscle as fat and end up "skinny fat."

Here's exactly how to do it right.

What Is a Cutting Diet?

A cut is a controlled calorie deficit phase with three goals:

1. Lose body fat — by eating below TDEE
2. Preserve muscle mass — through high protein and continued training
3. Maintain performance — so training quality stays high enough to signal muscle retention

It's different from "just dieting" because it's structured, time-limited, and protein-focused. Most people who "diet" and lose weight lose 30–50% of that weight from muscle. A proper cut targets 90%+ fat loss.

Step 1: Set Your Calorie Target

Your cut calorie target = TDEE − deficit.

Choosing your deficit:

Floor rule: Never eat below 1,200 kcal (women) or 1,500 kcal (men). Below these thresholds, micronutrient needs cannot be met and lean mass loss accelerates severely.

→ Use the TDEE Calculator then subtract your deficit.

Step 2: Set Your Macros

This is what separates a proper cut from general calorie restriction.

Protein — Set This First

Protein is the cornerstone of a cut. High protein:

• Directly signals muscle retention
• Is the most satiating macronutrient — reduces hunger significantly
• Has a high thermic effect (25–30% of protein calories burned in digestion)

Target: 1.8–2.4g per kg of bodyweight

Carbohydrates — Fuel Training

Keep carbohydrates high enough to maintain training quality. Strength performance drops measurably at low carb intakes, and reduced performance = reduced muscle retention signal.

Typical range: 35–45% of total calories from low-to-moderate GI carbs.

Fat — Minimum for Hormones

Fat should not go below 0.7g/kg. Below this, testosterone (men) and oestrogen (women) decline, impairing recovery, mood, and metabolic rate.

Typical range: 20–30% of total calories.

Example cutting macros — 75kg person, 1,800 kcal target:

Step 3: Choose Your Foods

Best Cutting Foods (High Protein, High Volume, Low Calorie)

Protein anchors:

• Chicken breast — 31g protein/100g cooked, ~165 kcal
• White fish (cod, haddock, tilapia) — 20g protein/100g, ~100 kcal
• Egg whites — 11g protein/100ml, 52 kcal
• Non-fat Greek yogurt — 10g protein/100g, 57 kcal
• Cottage cheese (low fat) — 12g protein/100g, 72 kcal
• Tuna (canned in water) — 23g protein/100g, 116 kcal

High-volume carbs:

• Oats — filling, slow-digesting
• Sweet potato — nutrient-dense, satisfying
• Rice — easy to portion, pairs with anything
• Fruit — low calorie density, high fibre

Volume vegetables (essentially free calories):

• Spinach, broccoli, courgette, mushrooms, cucumber, lettuce — eat as much as you want

Healthy fats (portion carefully — high calorie):

• Olive oil (1 tbsp = 120 kcal)
• Avocado (half = 120 kcal)
• Nuts (30g = 180 kcal)

Step 4: Structure Your Meals

A day of eating on a cut (1,800 kcal, 153g protein example):

Remaining 424 kcal can be allocated to healthy fats or additional carbohydrates around training.

Step 5: Train to Retain

The other half of a successful cut is the training. Do not stop lifting during a cut. Your muscle is retained because your body is being signalled to keep it. If you only do cardio during a cut, the body has no reason to maintain muscle — and it won't.

Training approach during a cut:

• Maintain strength training frequency — 3–4 sessions/week minimum
• Reduce volume slightly — 15–20% fewer sets is fine; less calorie drain
• Keep intensity — don't drop the weight. Percentage of 1RM should stay constant
• Add walking — 8,000–10,000 steps daily adds 300–500 kcal burn with zero recovery cost

→ Read more: Strength Training for Weight Loss

Managing Hunger on a Cut

Hunger is the enemy of adherence. These strategies reduce it:

High-volume eating: 400g of broccoli + 200g chicken = the same calories as a small bag of crisps. Food volume matters for satiety.

Protein at every meal: Protein is 2x more satiating per calorie than carbohydrates or fat.

Liquid calories are your enemy: Juice, alcohol, milk in coffee, protein bars — these don't register satiety well. Eat your calories, don't drink them.

Fibre: Aim for 25–30g/day from vegetables, legumes, oats, and fruit. Fibre slows gastric emptying and keeps you full longer.

Sleep: 7–9 hours reduces ghrelin (hunger hormone) and cortisol. Cutting on poor sleep means fighting biological hunger signals all day.

→ Read more: Calorie Deficit Without Hunger

Common Cutting Mistakes

1. Not tracking accurately — the most common reason cuts stall. Use a food scale for 4 weeks minimum.

2. Cutting too aggressively — a 1,000 kcal deficit feels productive but causes significant muscle loss. Moderate and consistent wins.

3. Eliminating carbs entirely — very low carb on a cut kills training performance. Keep carbs in, just from quality sources.

4. Stopping when progress stalls — weight loss plateaus are normal. Audit tracking accuracy, take a 1-week diet break, then reduce calories by 100–150 kcal and continue.

5. Ignoring strength training — the most expensive mistake. Without lifting, up to 50% of weight lost is muscle.

How Long Should You Cut?

Most people benefit from taking at least 4–8 weeks at maintenance after a 12+ week cut before attempting another cut.

The Bottom Line

A cutting diet is: TDEE − 300–500 kcal, protein at 1.8–2.4g/kg, continued strength training, high volume foods, and consistency for 8–16 weeks. Everything else is detail.

Use the Calorie Deficit Calculator to set your target, the Macro Calculator for your macros, and the Protein Calculator to confirm protein is high enough.

Sources

1. High-protein diet and lean mass preservation during cutting — Helms et al., IJSNEM, 2014
2. Resistance training preserves lean mass during energy restriction — Cava et al., Nutrients, 2017
3. Dietary fat minimum during calorie restriction — Hamalainen et al., Hormone Metabolic Research, 1984