BMI (Body Mass Index) is a measure of body fat based on height and weight. It is a useful screening tool to categorize whether an adult is underweight, normal weight, overweight, or obese.

TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day, accounting for both your basal metabolic rate (BMR) and physical activities.

For safe weight loss, you should consume about 250 - 500 calories less than your TDEE per day. This allows you to lose roughly 0.25kg to 0.5kg per week without feeling fatigued or losing muscle mass.