Question 1

What is a calorie deficit?

Accepted Answer

A calorie deficit occurs when you consume fewer calories than your body burns (TDEE). This forces your body to use stored energy (fat) for fuel, leading to weight loss. A deficit of 500 calories per day typically results in about 0.45kg (1lb) of weight loss per week.

Question 2

How big should my calorie deficit be?

Accepted Answer

A moderate deficit of 500 calories per day is generally recommended for sustainable weight loss (about 0.5kg/1lb per week). Mild deficits (250 cal) are slower but easier to maintain. Aggressive deficits (750+ cal) can lead to faster results but may cause muscle loss and are harder to sustain.

Question 3

What is the minimum safe calorie intake?

Accepted Answer

General guidelines suggest men should not eat below 1,500 calories/day and women below 1,200 calories/day without medical supervision. Very low calorie diets can lead to nutrient deficiencies, muscle loss, metabolic slowdown, and other health issues.

Question 4

How long will it take to reach my goal weight?

Accepted Answer

This depends on how much weight you need to lose and your daily deficit. This calculator provides a timeline estimate. As a rule of thumb, 1kg of body fat contains about 7,700 calories, so a 500-calorie daily deficit would take about 15 days per kg of weight loss.

Question 5

Will a calorie deficit cause muscle loss?

Accepted Answer

Some muscle loss can occur during a calorie deficit, but you can minimize it by: maintaining adequate protein intake (1.6-2.2g/kg), doing resistance training, keeping the deficit moderate (not extreme), and getting enough sleep.

Question 6

Should I exercise more or eat less?

Accepted Answer

The most effective approach combines both. Creating your deficit through diet alone can be hard to sustain, while exercise alone often does not create enough deficit for meaningful weight loss. A combination of reduced calorie intake and increased activity is ideal.

Calorie Deficit
Weight Loss Planner

Free Calorie Deficit Calculator

Understanding Calorie Deficits

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Deficit Comparison

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