Weight Loss
Conditions
Keywords
bone mass, calcium absorption, bone quality, fracture risk
Brief summary
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.
Detailed 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).
Interventions
BEHAVIORALCaloric restriction, high protein
Weight loss with higher protein (35%) intake
BEHAVIORALCaloric restriction; normal protein
Weight loss with normal level of protein (18%) intake
BEHAVIORALNutrition Education
Participants will have the opportunity to speak with the dietitian about their diet by phone, or on-site twice per month
Sponsors
National Institute on Aging (NIA)
Rutgers University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 70 Years
Healthy volunteers
No
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)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Changes in Bone mineral density and quality | one year |
Secondary
| Measure | Time frame |
|---|---|
| Changes in serum and urine bone markers, hormones, and proteins | one year |
Countries
United States
Outcome results
None listed