The Effect of Severe Weight Loss and Protein Intake on Bone

Rutgers The State University of New Jersey

Status

Terminated

Conditions

Weight Loss

Treatments

Behavioral: Caloric restriction; normal protein

Behavioral: Nutrition Education

Behavioral: Caloric restriction, high protein

Study type

Interventional

Funder types

Other

NIH

Identifiers

NCT00472680

5R01AG012161 (U.S. NIH Grant/Contract)

AG0082

Details and patient eligibility

About

The purpose of this study is to learn whether the amount of dietary protein can influence bone health during the weight loss after weight loss surgery.

Full description

It is unclear whether the amount of protein in the diet during caloric restriction influences bone density. This information is important for determining optimal nutrient requirements during weight loss. This study will examine usual and higher dietary protein intake during severe weight loss following weight loss surgery on bone turnover, mass and quality in women, with the hypothesis that higher protein intake will reduce bone turnover and loss, and/or prevent the changes in bone quality associated with severe weight loss in women ages 18 to 70 years.

Participants will be randomly assigned to one of 2 groups: A) weight loss with recommended level of protein intake, or B) weight loss with higher protein intake. A dietitian will provide instructions for a reduced calorie, well balanced diet throughout the 12-month study using a nutrition-education behavior- modification program. Participants will have the opportunity to speak with the dietitian about their diet by phone, or on-site twice per month. In addition they will be asked to take a daily vitamin/mineral supplement and, depending on their usual food intake, they may be asked to take a calcium tablet to meet the recommended intake throughout the study period. Bone, mineral, protein and lipid markers, and hormones that influence bones will be measured. These measurements will provide information about body composition (fat, muscle mass, and bone mineral density).

Enrollment

5 patients

Sex

Female

Ages

18 to 70 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Women ages 18 to 70 who are undergoing gastric bypass surgery
Must live in the geographic vicinity of Rutgers University

Exclusion criteria

Currently on any medication known to influence calcium or bone metabolism, including HRT, or with evidence of diseases known to influence calcium metabolism (i.e. metabolic bone disease, hyperparathyroidism, untreated thyroid disease, significant immune, hepatic, or renal disease, significant cardiac disease [i.e., heart attack or stroke in the past 6 months., abnormal EKG], active malignancy or cancer therapy within the past year)
History of kidney stones
Weight gain or weight loss (5% of body wt) within 3 months prior to recruitment
Participation in other investigational studies during the 12-month study period
Usually have a very high or low intake of calcium (more than 1500 or less than 500 mg per day)