Adequate Dairy Intake on Weight Change in Girls

Inclusion Criteria: * Age 13-14 years old (must be this age when consent is signed) * Above the 50th percentile for BMI * Above the 85th percentile for BMI with approval from their primary physician * At least one and one- half years post menarche * Habitual dietary calcium intake of 600mg/d or less as assessed by 3 day diet diary. This will be inclusive of supplemental calcium and dietary intake. * Willingness to increase dietary calcium (low fat \[skim, 1%, 2%\] milk or yogurt) for one year Exclusion Criteria: * Menarche prior to age 10 * History of lactose intolerance or milk allergy * Weight \>300 pounds * BMI \> 97 percentile for age and gender * Pregnancy * Chronic disease or disorder like diabetes, polycystic ovarian syndrome, thyroid disease, seizures or cancer (cancer is ok if it has been \>10 years) * Use of steroids like prednisone, prednisolone, hydrocortisone, Flovent, Advair, or Nasonex * Use of weight reducing medications like Meredia, alli, Dexatrim or Xenical * Use of contraceptives like Yasmin, Ortho Tri-Cyclen, Apri, Aviane or Depo-Provera for any reason, including acne (see inclusive list) * Use of acne medications like Accutane or high dose Vitamin A * Use of ADHD medications like Adderall, Ritalin, Concerta. (Per Dr. Ramaswamy-Straterra OK) (see inclusive list) * Use of seizure medications like Lamictal or Phenobarb (see inclusive list) * Use of anti-depressants like Prozac or Effexor (see inclusive list) * Diagnosed eating disorder * Dieting behavior with weight loss \> 10 pounds in the last 3 months (IF YES, consult with Project Manager) * Metal in the skeleton (pins, rods, etc) * Sibling of a child who is or has been on a dietary study in the last 5 years * Total body BMC Z-score below -2.0 at baseline * Participating in other ongoing research protocols