Her dental health
Make sure your daughter goes to the dentist every six months for preventative checkups. If she's frequently vomiting or starving herself, it will show up in her mouth.
Her clothing choices
Look at the clothes she's wearing. Girls who conceal their bodies in clothes that are way too big or girls whose excess fat is spilling out beyond the slight "muffin top" need intervention. You can get meaningful clues by looking at what your daughter chooses to wear and how she looks in her clothes.
Her menstrual cycle
Do your best to track her menstrual cycle. I don't suggest putting it on the family event calendar. But, you could make a note in your personal calendar after you've casually and privately asked her about her period. If your daughter had started her period and then stops for three months or more, you should be concerned.
Her exercise habits
If your daughter has created a training schedule to match that of Lance Armstrong, she may be overexercising, which may be an additional manifestation of an eating disorder.
The thought that your daughter might be starving herself, vomiting after meals or oblivious to her ever-increasing girth is terrifying. As a healthcare provider to teen girls and as a woman who has struggled with being overweight her entire life, I empathize. I know only too well from personal experience the feelings of both attachment and disdain for my favorite cookie. Neither adults nor kids need to be paragons of virtue when it comes to healthy eating and exercise. After all, no one is perfect. But keeping an eye on our developing teens and how their relationship to food and eating is taking shape is critically important.
Reflect on your own relationship with food, as this will influence your daughter. If you always complain about your weight or are beyond thrilled with new low-cal foods, then you too need some fine-tuning when it comes to your own eating habits. Unprocessed foods, lots of fruits and vegetables, whole grains, healthy fats, lean meats and fish or a sound vegetarian diet with portion control is the way to go for lifelong health. Adopt healthy habits of eating, and your chances of influencing your daughter to do the same will increase dramatically. Take advantage of being your daughter's best teacher when it comes to a healthy relationship with food.
Evelyn Resh is director of sexuality and relationships programming for Miraval Resorts in Tucson. She is a certified sexuality counselor and nurse-midwife and continues her practice in both fields in Tucson and Western Massachusetts. She has taken care of teens and women of all ages in OB-GYN and primary care settings for more than 20 years and specializes in working with women 25 and under. She is also the mother of a 19-year-old daughter. Evelyn speaks all over the nation on topics related to women's health and sexual satisfaction and is the author of the new book The Secret Lives of Teen Girls: What Your Mother Wouldn't Talk About but Your Daughter Needs to Know published by Hay House Publishers.
More from Evelyn Resh:
How to help your teenage daughter manage her weight
How to talk to your daughter about weight
What you should do if you love your teenage daughter but just can't stand her right now
The 4 most important things your daughter needs to know before she leaves for college