Estimates only - not medical advice.
TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor that accounts for movement and exercise. Eat at your TDEE to maintain. Eat below it to lose. Eat above it to gain. The Mifflin-St Jeor formula handles the BMR calculation here.
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Total Daily Energy Expenditure: the calories your body uses in a full day, combining resting metabolism (60 to 70 percent of the total), movement, exercise and digestion. It is the number your calorie intake is measured against.
A 500-calorie daily deficit targets roughly one pound per week. Smaller deficits (250 to 300 calories) are often more sustainable. Dropping below your BMR for extended periods tends to cause muscle loss and metabolic adaptation.
BMR from the Mifflin-St Jeor equation, multiplied by an activity factor ranging from 1.2 (sedentary) to 1.725 (very active).
No - an estimate.