A calorie deficit without starving: lose fat and stay strong

Fat comes off one way: over time you take in less energy than you use. Every diet that works — keto, fasting, calorie counting, "clean eating" — works because it creates that deficit. The only difference is which one you can live with.

Find your starting point

A rough estimate of daily expenditure: body weight (kg) × 30 if you have a desk job and train three times a week. For 80 kg that is about 2400 kcal.

A deficit that works without wrecking your training: 15–20 % below expenditure. In our example: 1950–2050 kcal a day.

What speed is realistic

• 0.5–0.8 % of body weight per week is the range where you lose fat while keeping muscle and strength.
• For 80 kg that is 400–650 g a week, or 1.5–2.5 kg a month.
• Anything faster than 1 % per week means losing some muscle too, and with it your strength in the gym.

How not to be hungry

1. Protein at every meal (25–45 g). It is the most filling food per calorie.
2. Food volume: salad, cabbage, courgette, tomatoes, cucumber, mushrooms — a full plate for very few calories.
3. Do not drink your calories. Juice, soft drinks, lattes and alcohol pass without filling you up. Water, tea and black coffee have none.
4. Keep carbohydrates around training. Rice, potatoes and bread before or after the gym are fuel for lifting, not an obstacle.
5. Sleep 7–8 hours. Short sleep raises hunger and kills the will to train.

Why the scale stalls for three weeks

This is the most common reason people abandon a diet that is working. The scale measures water, food in your gut and glycogen — not just fat. The typical pattern: seven days of nothing, then suddenly a kilo down.

So:

• Weigh yourself once a week, same day, in the morning, after the toilet — and look at the four-week average, not a single number.
• Measure your waist once every two weeks as well.
• If the average has not moved for three weeks in a row, cut 100–150 kcal or add 2000 steps a day.

Training while dieting

Do not turn your training into "fat burning": stay with weights, 8–12 reps, same plan. In a deficit the goal is not growth, it is keeping your strength — that is the signal that tells your body to hold on to muscle. Cardio is a tool for extra expenditure, not a replacement for lifting. Walking or cycling 20–30 minutes, 3–4 times a week, is plenty.

What about "bad" days

One big meal does not ruin a week. What ruins it is the rule "I have blown the diet, I will start again on Monday" — that turns one meal into five days. Get back on plan at the next meal, not next month.

When to take a break

After 8–12 weeks in a deficit, take 1–2 weeks at maintenance (eating what you burn). Hunger settles, strength comes back, and it is easier to continue. Long diets without a break almost always end in a binge.

The short version

• A deficit of 15–20 % below expenditure, no more.
• 0.5–0.8 % of body weight per week is a healthy pace.
• Protein + lots of vegetables + no liquid calories = not hungry.
• Weigh once a week and watch the average.
• Keep lifting heavy while dieting — that is what keeps the muscle.