Ever since I started high school, I have lost weight. I am in year 12, am 171cm and I weigh 52kg. I have noticed that other girls that are younger than me weigh more. I eat so much, but I can never gain weight! I am really skinny and I always get self-conscious about it. My sister weighs 10kg more than me and she is 12. Is there anything I can do to help my weight be normal?
Your body mass index (BMI) is 17.8 and does place you in the underweight category. However, this is only an indicator and it’s important to chart your weight and height to get a good picture of your progress over time, compared with others at your age. A growth spurt or doing heaps of physical activity can use up the calories you consume. While there are lots of possible medical causes of weight loss, an overactive thyroid is worth ruling out with a simple blood test. The thyroid (a gland in your neck) controls metabolic rate and weight loss is common when it’s overactive. Please see your doctor.