Normal Weight

Normal weight means having a BMI between 18.5-24.9, which at the population level is associated with the lowest morbidity and mortality risks. For a person who is 170 cm tall, the normal weight range is approximately 53-72 kg. This is a wide range, however, and what matters more for health is what the weight is made of.

Being normal weight doesn't automatically mean good health or body composition. So-called 'skinny fat' or normal-weight obesity is a condition where BMI is normal but body fat percentage is high and muscle mass is low. This is surprisingly common, especially among sedentary individuals. In a skinny fat state, one can have the same metabolic risks as an overweight person: elevated blood sugar, high triglycerides, and poor insulin sensitivity.

Normal weight is also not a single number but a range. Body weight naturally fluctuates 1-3 kg during the day due to fluid balance, food volume, and hormonal changes (especially the menstrual cycle). This is why you shouldn't fixate on individual scale readings but rather track the weekly average trend.

More important than BMI category is holistic health. A normal-weight person should focus on optimizing body composition: adequate muscle mass, moderate body fat percentage, physical activity, good nutrition, sufficient sleep, and mental well-being. A fit person at normal weight combined with good muscle mass provides the best protection against disease. Normal weight is related to BMI, overweight, and body composition concepts.

Last updated: March 30, 2026