Utilizing Protein During Weight Loss to Impact Physical Function and Bone

N/ACompletedNCT03819478

Wake Forest University Health Sciences187 enrolled

Overview

This study is an ancillary study to the Utilizing Protein During Weight Loss to Impact Physical Function (UPLIFT) trial (NCT03074643) to evaluate the effects of diet composition (i.e., amount of protein and carbohydrate) during a 6-month weight loss intervention and 12-months of follow-up on bone phenotypes in obese older adults. Participants will receive either a protein or carbohydrate supplement along with a behavioral weight loss intervention.

The ancillary study to the UPLIFT trial (NCT03074643) will use a 3-group design in 225 obese (body mass index \[BMI\] 30-45 kg/m2 or 27-\<30 kg/m2 with an obesity-related risk factor), older (65-85 years) men and women at risk for disability (Short Physical Performance Battery, SPPB ≤10) who will undergo a 6-month weight loss intervention followed by a 12-month follow-up phase to test the overall hypothesis that a higher protein (1.2 g/kg body weight/day) / lower carbohydrate (CHO) diet during a 6-month weight loss intervention improves bone phenotypes compared with an isocaloric lower protein (the current Recommended Dietary Allowance (RDA), 0.8 g/kg body wt/d) / higher CHO diet, and whether continuing a higher protein / lower CHO diet for 12-months following weight loss will result in better maintenance of bone. All participants will undergo a 6-month weight loss intervention involving caloric restriction and supervised exercise followed by 12 months of follow-up with randomization to one of three groups (n=75/group): 1) Lower protein / higher CHO diet for the 6-month weight loss phase only (RecProt); 2) Higher protein / lower CHO diet for the 6-month weight loss phase only (6-mo HiProt); or 3) Higher protein / lower CHO diet for the 6-month weight loss and 12-month follow-up phases (18-mo HiProt). Vertebral and femoral volumetric bone mineral density and cortical thickness (Primary Aim) and bone marrow adipose tissue (Secondary Aim 1) will be assessed with computed tomography at baseline, 6-, and 18-months. Bone strength and fracture risk (Secondary Aim 2) will be assessed by finite element modeling at baseline, 6-, and 18-months.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Interventions

Weight loss intervention months 0-6BEHAVIORAL

All participants will undergo a dietary weight loss intervention designed to elicit behavioral changes leading to decreased caloric intake sufficient to yield a \~10% loss of initial body mass. The weight loss intervention will incorporate nutrition education (via group and individual meetings with the study dietitian), self-monitoring skills, cognitive-behavioral strategies for promoting lifestyle behavior modifications, and planned meals. Behavioral and educational group and individual sessions will be held weekly in a 3:1 ratio (3 group and 1 individual session per month).

Exercise intervention months 0-6BEHAVIORAL

All participants will be expected to participate in a supervised, center-based exercise program involving moderate-intensity aerobic exercise (e.g., treadmill walking) 3 days/wk during the 6-month weight loss intervention in accordance with the American Heart Association and the American College of Sports Medicine physical activity recommendations for older adults.

NutraBio™ CarboMax SupplementDIETARY_SUPPLEMENT

Participants in the lower protein / higher CHO diet group (RecProt) will be provided a carbohydrate supplement (NutraBio™ CarboMax, \~50 g of carbohydrate and 220 calories) to consume daily during the 6 month weight loss intervention.

6-month NutraBio™ 100% Whey Protein Isolate SupplementDIETARY_SUPPLEMENT

Participants in the 6-month higher protein / lower CHO diet group (6-mo HiProt) will be provided a protein supplement (NutraBio™ 100% Whey Protein Isolate, \~50 g of protein and 220 calories) to consume daily during the 6 month weight loss intervention.

18-month NutraBio™ 100% Whey Protein Isolate SupplementDIETARY_SUPPLEMENT

Participants in the 18-month higher protein / lower CHO diet (18-mo HiProt) will be provided a protein supplement (NutraBio™ 100% Whey Protein Isolate, \~50 g of protein and 220 calories) to consume daily during the 6 month weight loss intervention and the 12-month follow-up.

Eligibility

Sex: ALLMin age: 65 YearsMax age: 85 Years

Medical Language ↔ Plain English

Subjects are recruited using inclusion and exclusion criteria of the parent trial (UPLIFT; NCT03074643). Inclusion Criteria: * 65-85 years * BMI: 30-45 kg/m2 or BMI 27.0 - \<30.0 AND at least one of the following risk factors: 1. elevated waist circumference (\>35 inches in women, \>40 inches in men) 2. diabetes, 3. hypertension, 4. dyslipidemia, 5. or other obesity-related comorbidities: clinically manifest coronary artery disease \[e.g., history of myocardial infarction, angina pectoris, coronary artery surgery, coronary artery procedures (e.g., angioplasty) if not within the past year\], other atherosclerotic disease \[e.g., peripheral arterial disease, abdominal aortic aneurysm, symptomatic carotid artery disease if not within the past year\], sleep apnea, or osteoarthritis of the knee or hip. * No regular resistance training and/or aerobic exercise (\>20 mins/d) for past 6 months * SPPB ≥3 to ≤10 * No contraindications for safe and optimal participation in exercise training * Approved for participation by Medical Director (Dr. Lyles) * Willing to provide informed consent * Agree to all study procedures and assessments * Willing to consume protein/CHO supplements for up to 18 months * Able to provide own transportation to study visits and intervention sessions Exclusion Criteria: * Weight loss (≥5%) in past 6 months * Dependent on cane or walker * Cognitive impairment (Montreal Cognitive Assessment, MoCA score \<22) * Severe arthritis, or other musculoskeletal disorder * Joint replacement or other orthopedic surgery in past year * Uncontrolled resting hypertension (\>160/90 mmHg); * Uncontrolled diabetes (hemoglobin A1c, HbA1c ≥8.0%) * Current or recent past (within 1 year) severe symptomatic heart disease, uncontrolled angina, stroke, chronic respiratory disease requiring oxygen; uncontrolled endocrine/metabolic disease; neurological or hematological disease; cancer requiring treatment in past year, except non-melanoma skin cancers; liver or renal disease; or clinically evident edema * Unstable Severe Depression * Serious conduction disorder, uncontrolled arrhythmia, or new Q waves or ST-segment depressions (\>3 mm at rest or ≥2 mm with exercise) * Abnormal kidney function (estimated glomerular rate \<30 based on serum creatinine, age, gender, and race) * Anemia (Hb\<13 g/dL in men; \<12 g/dL in women) * Drug abuse or excessive alcohol use (\>7 drinks/week women; \>14 drinks/week men) * Use of any tobacco or nicotine products in the past year * Osteoporosis (T-score \< -2.5 on hip or spine scan) * Regular use of growth/steroid hormones, sex steroids or corticosteroids * Osteoporosis medication * Protein supplements (and unwilling to stop using for duration of study) * Weight loss medications or procedures * Current participation in another intervention study

Outcomes

Primary Outcomes

18-month Change From Baseline in Total Hip Trabecular Volumetric Bone Mineral Density Assessed by Computed Tomography (CT) in mg/cm^3

To determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 18-month change from baseline in total hip trabecular volumetric bone mineral density (vBMD). Total hip trabecular vBMD (in mg/cm\^3) was measured from the baseline and 18-month quantitative CT scans using the Mindways Model 3 phantom to calibrate the vBMD measures. The 18-month change in total hip trabecular vBMD from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 18

Secondary Outcomes

6-month Change From Baseline in Percentage of Adipose Tissue Within the Lumbar Spine Bone Marrow as Assessed by Dual-energy Computed Tomography Algorithm

Percentage of adipose tissue within the lumbar spine bone marrow as assessed by a dual-energy computed tomography (CT) algorithm to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet. Percentage of adipose tissue within the bone marrow was measured from the baseline and 6-month dual-energy CT scans using a Mindways Model 3 phantom for calibration. The 6-month change in percentage of adipose tissue within the lumbar spine bone marrow from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 6

18-month Change From Baseline in Percentage of Adipose Tissue Within the Lumbar Spine Bone Marrow as Assessed by Dual-energy Computed Tomography Algorithm

Percentage of adipose tissue within the lumbar spine bone marrow as assessed by a dual-energy computed tomography (CT) algorithm to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet. Percentage of adipose tissue within the bone marrow was measured from the baseline and 18-month dual-energy CT scans using a Mindways Model 3 phantom for calibration. The 18-month change in percentage of adipose tissue within the lumbar spine bone marrow from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 18

6-month Change From Baseline in Femoral Bone Strength in kN

Subject-specific finite element models were created from the baseline and 6-month CT scans and femoral bone strength was assessed from a simulated test of a sideways fall. Bone strength was measured as the peak section force extracted at the femoral neck to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 6-month change from baseline in femoral bone strength.

Time frame: Change from Baseline to Month 6

18-month Change From Baseline in Femoral Bone Strength in kN

Subject-specific finite element models were created from the baseline and 18-month CT scans and femoral bone strength was assessed from a simulated test of a sideways fall. Bone strength was measured as the peak section force extracted at the femoral neck to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 18-month change from baseline in femoral bone strength.

Time frame: Change from Baseline to Month 18

18-month Change From Baseline in Femoral Cortical Thickness Assessed by Computed Tomography (CT) in mm

Cortical thickness of the proximal femur was assessed by a computed tomography (CT) based algorithm to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 18-month change from baseline in femoral cortical thickness. Cortical thickness was measured from the baseline and 18-month CT scans, and the 18-month change from baseline (in mm) is reported for this outcome measure.

Time frame: Change from Baseline to Month 18

6-month Change From Baseline in Femoral Cortical Thickness Assessed by Computed Tomography (CT) in mm

Cortical thickness of the proximal femur was assessed by a computed tomography (CT) based algorithm to determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 6-month change from baseline in femoral cortical thickness. Cortical thickness was measured from the baseline and 6-month CT scans, and the 6-month change from baseline (in mm) is reported for this outcome measure.

Time frame: Change from Baseline to Month 6

18-month Change From Baseline in Vertebral Volumetric Bone Mineral Density in the Lumbar Spine Assessed by Computed Tomography (CT) in mg/cm^3

To determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 18-month change from baseline in vertebral volumetric bone mineral density (vBMD) in the lumbar spine. Trabecular vBMD (in mg/cm\^3) was measured from the baseline and 18-month quantitative CT scans using the Mindways Model 3 phantom to calibrate the vertebral vBMD measures. The 18-month change in vertebral vBMD in the lumbar spine from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 18

6-month Change From Baseline in Vertebral Volumetric Bone Mineral Density in the Lumbar Spine Assessed by Computed Tomography (CT) in mg/cm^3

To determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 6-month change from baseline in vertebral volumetric bone mineral density (vBMD) in the lumbar spine. Trabecular vBMD (in mg/cm\^3) was measured from the baseline and 6-month quantitative CT scans using the Mindways Model 3 phantom to calibrate the vertebral vBMD measures. The 6-month change in vertebral vBMD in the lumbar spine from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 6

6-month Change From Baseline in Total Hip Trabecular Volumetric Bone Mineral Density Assessed by Computed Tomography (CT) in mg/cm^3

To determine the effects of a higher protein / lower CHO diet vs. lower protein / higher CHO diet on the 6-month change from baseline in total hip trabecular volumetric bone mineral density (vBMD). Total hip trabecular vBMD (in mg/cm\^3) was measured from the baseline and 6-month quantitative CT scans using the Mindways Model 3 phantom to calibrate the vBMD measures. The 6-month change in total hip trabecular vBMD from baseline is reported for this outcome measure.

Time frame: Change from Baseline to Month 6

Utilizing Protein During Weight Loss to Impact Physical Function and Bone

Overview

Conditions

Interventions

Eligibility

Locations (1)

Outcomes

Primary Outcomes

Secondary Outcomes