How many calories should you eat to lose fat

Fat loss comes down to one idea: eat a little less energy than you burn, consistently, for long enough. Everything else is detail. This article walks through how to find your own number instead of copying someone else's.

Energy balance, without the guilt

A calorie is a unit of energy, nothing more. When you take in less than your body uses, it makes up the difference from stored fat. That is the entire mechanism. It is not a moral test, and food is not something you have to earn or repay.

This matters because so much diet advice is wrapped in shame — "good" foods, "cheat" meals, days you have to make up for. None of that is physics. A brownie is not a failure and a salad is not a virtue; they are both just energy, in different amounts. Once you see calories as information rather than judgement, the whole thing gets calmer and a lot easier to stick to.

So the real question is not "what am I allowed to eat" but "how much energy does my body actually use" — and then, "how far below that should I sit."

Start with maintenance

Your maintenance calories — often called your TDEE, or total daily energy expenditure — are what you burn on an average day. It bundles four things: the energy to keep you alive at rest, the cost of digesting food, your deliberate exercise, and all the incidental movement in between (fidgeting, walking, standing).

You can't measure this perfectly at home, but you can estimate it well. A good calculator uses your height, weight, age, sex and activity level to land in the right neighbourhood.

Treat the result as a starting point, not a verdict. Two people with identical stats can differ by a few hundred calories a day, so the number the calculator gives you is a hypothesis to test — which is exactly what the next steps do.

Choose a deficit you can actually live with

Once you have maintenance, fat loss just means eating below it. The size of that gap sets your pace — and this is where most people overreach.

A sensible deficit is roughly 0.5–0.75% of your body weight per week. For someone around 80 kg, that is about 0.4–0.6 kg a week. It feels slow. It is meant to. A moderate deficit lets you:

• Keep more muscle, so you lose fat rather than just weight.
• Stay strong in the gym and energetic in daily life.
• Eat enough protein and fibre to feel full instead of ravenous.
• Have the mental slack to keep going for months, not days.

Crash diets do the opposite. Cut too hard and you lose more muscle, tank your energy, wreck your training, and set yourself up for the all-or-nothing rebound that undoes the whole effort. The aggressive plan almost always loses to the boring one, because the boring one is the one you finish.

The number is a hypothesis, not a rule

Here is the part almost no diet plan tells you: your starting calorie target is a best guess, and best guesses are meant to be revised.

Your body responds. As you lose weight you burn a little less, and your day-to-day movement quietly adjusts too. So the target that worked in week one may stall by week five. That is not failure or a "broken metabolism" — it is the normal, expected drift of a moving system.

The fix is to watch your weight trend, not any single morning's number, which bounces around with water, salt and sleep. Take the average of your daily weigh-ins across one to two weeks and compare it to the fortnight before. If the trend is falling at roughly the pace you planned, hold steady. If it has flattened for two weeks straight, nudge intake down a little — 100 to 150 calories — and watch again. You are running a slow, patient experiment on a sample size of one: you.

Let the target adjust to you

That loop — set a number, watch the trend, adjust — is the whole game, and it is easy to describe and tedious to do by hand. That is where Sophia comes in. She sets your starting calorie target from your own numbers and goals, then reads your weight trend each week and moves the target accordingly — easing off when you need a break, nudging it when things stall — so you always know what to eat next without doing the maths yourself.