The diet world has hundreds of names for it, but the physiology is one and the same: when your body takes in less energy than it burns, it draws on the fat it has stored. This is called a calorie deficit. So how do you create that deficit in a healthy way?
First, know your maintenance calories
A calorie deficit starts with the answer to "How many calories do I need?" That number is called your maintenance calories (TDEE), and it varies with age, height, weight, and activity level. To get started, you can use the daily calorie needs calculator. Going below that number creates a deficit.
How big a deficit is reasonable?
A common approach is a deficit of roughly 300–500 kcal per day below your maintenance calories. For most people, that works out to a change of about half a kilogram per week — it looks slow, but that's exactly what tends to stick. Based on your goal, you can see the exact number with the calorie deficit calculator.
Why does an overly aggressive deficit backfire?
The "the less I eat, the faster it goes" logic usually doesn't hold up. Very low calories tend to lead to hunger, low energy, muscle loss, and, more often than not, giving up on the whole thing. Sustainability is the key here too: a deficit you can actually stick with beats a perfect one that lasts three days.
Don't neglect protein and tracking
During a deficit, getting enough protein helps protect muscle; you can see how much you need with the protein calculator. On the tracking side, logging with a photo makes the job easier — you can follow the trend across your day without weighing every meal.
For informational purposes only — not medical advice. If you have symptoms or a medical condition, consult a doctor.
