4 Nov Teenagers need to take into account these tips when aiming for fat loss to remain safe and healthy. Use the following 7 tips, workout and nutrition plan. 18 Jul Drastically cutting calories to lose belly fat when you're a teenage girl isn't wise. You need optimal nutrients because your body and brain are. 18 Jul Puberty also affects how your body stores fat, so it's normal for girls to gain fat because of hormonal changes. Although it's still important to eat healthy food and stay active in your teens, don't get too hung up on your teen bodily changes. If you're living a healthy lifestyle, it's likely you'll stay within a healthy.