Calorie Deficit: How It Works and How Much You Need

A calorie deficit occurs when you consume less energy through food and drinks than your body burns on a daily basis. Your body uses energy in three main ways: maintaining your basal metabolic rate, physical activity, and digesting food. When the sum of these exceeds your calorie intake, your body compensates for the missing energy from its reserves, primarily from fat stores. A diet plan supports this process in a structured way. The size of your deficit determines how quickly you lose weight and how sustainable it is long term.

For healthy and sustainable fat loss, a daily deficit of 300-500 calories is recommended, resulting in 1-2 pounds of weight loss per week. A larger deficit, especially over 1000 calories, threatens muscle mass and slows down metabolism, making long-term fat loss harder. For women, intake below 1200 calories and for men below 1500 calories poses health risks. The GetFIT App automatically calculates your optimal calorie intake based on your goals and activity level. Rapid weight loss always backfires, so patience is key.

First, you need to determine your basal metabolic rate, which is the amount of calories your body burns at rest. Next, factor in your daily activity level to get your total daily energy expenditure. To create a deficit, subtract 300-500 calories from this number, depending on how quickly you want to lose weight.

If you're not experiencing fat loss despite being in a deficit, inaccurate calorie tracking is usually the culprit. We often underestimate the amount we consume or overestimate calories burned during workouts. Your body may have adapted to the lower calorie intake and reduced your metabolism, especially after a prolonged dieting period. Water retention, stress, or lack of sleep can also mask real fat loss on the scale. Using grocery lists and pre-planned high protein recipes in our app, the GetFIT App, makes it easier to accurately maintain your calorie intake.

How long should I stay in a calorie deficit?