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BetterProduct Editorial Team
Calories are units of energy, and managing them is the foundation of weight management. While 'calories in vs. calories out' is an oversimplification, understanding your caloric needs and how different foods affect your energy balance is essential for reaching and maintaining a healthy weight. This guide covers the science and practical strategies for sustainable weight management.
BetterProduct Editorial Team
Checked against public health guidance and standard screening formulas. Not a diagnosis.
March 2026
Educational estimates and everyday wellness planning.
7 language editions aligned from the same source formulas.
Your Total Daily Energy Expenditure (TDEE) is the total calories you burn per day. It includes your Basal Metabolic Rate (BMR — calories burned at rest), plus calories from daily activities and exercise. The Mifflin-St Jeor equation is the most accurate formula for estimating BMR. Multiply by an activity factor (1.2 for sedentary to 1.9 for very active) to get TDEE.
One pound of fat contains approximately 3,500 calories. A daily deficit of 500 calories leads to about 1 pound of weight loss per week. Avoid deficits larger than 1,000 calories/day — extreme restriction causes muscle loss, nutrient deficiencies, and metabolic adaptation. A moderate deficit of 300–500 calories/day is sustainable and effective.
Protein (4 cal/g) is the most satiating macronutrient and preserves muscle during weight loss — aim for 0.7–1g per pound of body weight. Fat (9 cal/g) is calorie-dense but essential for hormones and satiety. Carbohydrates (4 cal/g) are the body's preferred energy source. Fiber-rich carbs (vegetables, legumes, whole grains) promote fullness and gut health.
Tracking calories in an app (MyFitnessPal, Cronometer) increases awareness and accountability. Eating mostly whole, minimally processed foods naturally reduces calorie intake. Prioritizing protein and fiber at each meal reduces hunger. Regular strength training preserves muscle and keeps metabolism higher during weight loss. Sleep deprivation increases hunger hormones — prioritize 7–9 hours.