Girls in puberty are growing and changing into young adults. They need nutritious foods and a healthy diet to grow properly. People should eat three nutritious meals a day and limit snacking. Fruits and vegetables are essential for everyone, not just pubescent girls.
It is easier to play sports and learn and study at school when you eat healthy.
Do not overeat or snack too much. Are you eating because you are hungry? Or are you eating because you are bored or depressed? Or is it a mere habit?
Getting enough calories each day is important so you can have enough energy to do well at school, at sports if you play, and with other things.