nutritionMarch 1, 2026

Hướng dẫn Thâm hụt Calo: Giảm cân An toàn và Hiệu quả

Weight loss comes down to one fundamental principle: consuming fewer calories than your body burns. But how many calories should you eat? This guide explains the science of caloric deficit and helps you find the right balance for sustainable, healthy weight loss.

Understanding Caloric Deficit

A caloric deficit occurs when you eat fewer calories than your Total Daily Energy Expenditure (TDEE). Since 1 pound of fat contains approximately 3,500 calories, a daily deficit of 500 calories should theoretically result in about 1 pound of weight loss per week. However, actual weight loss involves complex metabolic adaptations and isn't purely mathematical.

How to Calculate Your Calorie Needs

Start by calculating your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation, then multiply by an activity factor to get your TDEE. For weight loss, subtract 250-750 calories from your TDEE. A moderate deficit of 500 calories per day is generally recommended as sustainable. Never go below 1,200 calories for women or 1,500 for men without medical supervision.

Safe Rate of Weight Loss

Experts recommend losing 0.5-1 kg (1-2 lbs) per week for sustainable results. Losing weight too quickly can lead to muscle loss, nutritional deficiencies, gallstones, and metabolic slowdown. People with more weight to lose can safely lose at a faster rate initially. As you approach your goal weight, a slower rate of loss helps preserve lean mass and maintain results long-term.

Why Calorie Quality Matters

Not all calories are equal in terms of satiety, nutrition, and metabolic effects. Protein calories increase fullness and have the highest thermic effect (your body burns 20-30% of protein calories during digestion). Complex carbohydrates and fiber keep you satisfied longer than simple sugars. Whole foods require more energy to digest than processed foods. Focus on nutrient-dense foods to maintain health while in a deficit.

Common Mistakes When Cutting Calories

Cutting too many calories too quickly causes metabolic adaptation and muscle loss. Not eating enough protein leads to disproportionate muscle loss. Skipping meals often leads to overeating later. Ignoring liquid calories (sodas, juices, alcohol) can sabotage your deficit. Not adjusting calories as you lose weight means your deficit shrinks over time. Being too restrictive leads to binge eating and diet abandonment.

Maintaining Weight Loss Long-Term

After reaching your goal weight, gradually increase calories to your new TDEE (which will be lower due to reduced body weight). Continue monitoring your intake for several months. Regular exercise, especially strength training, helps maintain metabolic rate. Focus on building sustainable eating habits rather than temporary diets. Studies show that people who maintain weight loss exercise regularly, eat breakfast, and monitor their weight.

Calculate Your Daily Calorie Needs

Use our free Calorie Calculator to find your personalized daily calorie target for weight loss, maintenance, or gain.

Try Calorie Calculator

Frequently Asked Questions

Is 1,200 calories a day enough?

1,200 calories is generally considered the minimum for women; men should not go below 1,500. Very low calorie diets can lead to nutrient deficiencies and metabolic adaptation. Consult a healthcare provider before following a very low calorie diet.

How long does it take to lose 10 kg?

At a healthy rate of 0.5-1 kg per week, losing 10 kg would take approximately 10-20 weeks. The rate depends on your starting weight, caloric deficit, activity level, and individual metabolism. Patience and consistency are key.

Should I count calories or macros?

Both approaches work for weight loss. Counting calories alone is simpler. Tracking macros ensures you get adequate protein to preserve muscle. For best results during weight loss, focus on maintaining a caloric deficit while eating at least 1.6g of protein per kg of body weight.