How to Set a Calorie Deficit You Can Actually Keep

1. Start from your maintenance calories

A deficit only means anything relative to your TDEE — the calories you burn in a normal day. Get that number first with the TDEE calculator, then subtract from it. Never pick a round number like 1,500 kcal because it sounds disciplined; for a 75 kg person training four times a week that can be a 40 percent deficit.

2. Take 15-20 percent off, not more

• TDEE 2,000 kcal → eat about 1,650 kcal
• TDEE 2,500 kcal → eat about 2,050 kcal
• TDEE 3,000 kcal → eat about 2,450 kcal

That lands you near 0.5-0.75 percent of body weight lost per week. Slower than the internet promises, but you keep your strength, your sleep and your social life — which is the whole reason it works.

What a bigger deficit really costs

Below roughly 25 percent, three things degrade at once: you lose more lean mass per kilo lost, training performance drops so the stimulus that protects muscle disappears, and hunger becomes loud enough that a single bad evening erases three good days. Aggressive deficits are not braver, they are just less reliable.

3. Set protein before you touch anything else

In a deficit, protein is the variable that decides whether you lose fat or lose weight. Aim for 1.6-2.2 g per kg per day and treat it as the floor of your plan — details in the protein guide. Fill the remaining calories with carbs and fat in whatever split you enjoy; adherence beats ratios.

4. Judge it on two weeks, not two days

Daily weight swings 1-2 kg on water, salt, carbs and sleep. Compare a seven-day average to the previous seven-day average. Then:

• Losing 0.5-0.75%/week: change nothing. This is working.
• Flat for two full weeks: cut 150-200 kcal, or add 2,000 daily steps. One change at a time.
• Losing faster than 1%/week: add 150-200 kcal back. That pace is usually borrowing muscle.

5. Plan the indulgence in advance

Every sustainable deficit has slack built in. Reserve 100-250 kcal a day for the snack you actually want, or bank a few hundred for a Friday meal out. A deficit with a planned exit hatch survives; a perfect one with no room breaks the first time life is inconvenient.

6. Expect the plateau and don't panic

As you lose weight your TDEE falls — a smaller body costs less to run, and you unconsciously move less. That is normal physiology, not a broken metabolism. Re-check your TDEE every 4-5 kg, and consider a week at maintenance every 8-12 weeks to reset appetite and training quality.

The short version

• Find your TDEE, subtract 15-20 percent.
• Hit 1.6-2.2 g/kg protein daily.
• Judge weekly averages, adjust by 150-200 kcal at a time.
• Leave calories spare for the food you enjoy.