Nutrition Intervention in AIDS Wasting

Inclusion Criteria: * Loss of 10% of usual body weight, OR loss of 5% of usual body weight within the previous 6 months, OR BMI20kg/m2. If the candidate is taking a protease inhibitor, he/she must have not regained weight since initiating the medication over a period of at least 4 weeks prior to screening. * Documented HIV-positive * Able to eat * English-speaking * Compliance with medical regimens * For heterosexually active women: willingness to use an effective means of birth control * Patient and physician not planning to start new treatments for HIV infection or weight loss during the 12 weeks of study. Exclusion Criteria: * Vomiting 1 time/day or diarrhea 4 times/day on average in the previous week * Fever 101 F within the previous week * Receiving induction treatment for one of the following (new diagnosis or recurrence within 4 weeks): Pneumocystis carinii pneumonia Cryptococcal meningitis Cytomegalovirus retinitis or pneumonitis Toxoplasmosis Mycobacterium avium complex Visceral Kaposi's Sarcoma Lymphoma Pulmonary tuberculosis * Received corticosteroids, estrogens, progesterones, androgens, oral anticoagulants, or growth hormone within the previous three months * History of life-threatening reaction to oxandrolone or testosterone * Currently pregnant * History of congestive heart failure, myocardial infarction, angina/coronary artery disease, uncontrolled hypertension, cerebrovascular accident, hepatic failure, bleeding disorder, diabetes, nephrotic syndrome, cancer of the breast or prostate, or hypercalcemia * Milk product allergy * Current use of injected drugs * Participation in an exercise program or strength training within the previous 4 weeks * Any medical condition which renders the participant physically incapable of performing strength exercises * Serum total testosterone level at least 300ng/ml, unless patient and primary physician prepared to begin testosterone injections concurrent with study enrollment (men only).