Protein Eating Patterns and Weight Loss
- Conditions
- Obesity
- Interventions
- Other: Even proteinOther: Skewed protein
- Registration Number
- NCT03202069
- Lead Sponsor
- USDA Grand Forks Human Nutrition Research Center
- Brief Summary
The purpose of this study is to determine the effects of daily protein intake patterns on body composition and eating behaviors during weight loss.
- Detailed Description
The reinforcing value of food varies greatly among individuals, but is strongest for those who are overweight or obese. Reducing energy intake, which is necessary for overweight and obese individuals to achieve a healthier body weight, increases the reinforcing value of food - especially for energy-dense snack foods. Food is a powerful reinforcer and is associated with energy intake; making it a primary contributing factor to an individual's weight loss struggle. Developing a way to decrease or limit the increase in food reinforcement during energy deficits would have important clinical impact. High-protein diets are known to be efficacious for weight loss and recently have been shown to decrease stimulation of the reward areas of the brain that stimulate reward-driven eating behavior. Nonetheless, sustaining a high-protein diet can be difficult, especially for women. Consuming a modest amount of protein at each meal may be better tolerated. However, we do not know whether this pattern of protein intake can assist women in staying "on track" with weight loss goals. This study will help begin to elucidate the connections between the daily pattern of protein intake on diet adherence, alterations in food reinforcement, and favorable body composition changes during weight loss.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Female
- Target Recruitment
- 45
- BMI 28-45 kg/m2
- unable or unwilling to consume animal products
- unable or unwilling to attend treatment group meetings
- had more than a 10% change in body weight in the 2 months prior to study start date
- consuming a specialized diet
- have a history of and eating or gastrointestinal disorder
- currently or planning on becoming pregnant during the study timeline
- lactating
- have an uncontrolled metabolic illness/disease (fasting glucose >125 mg/dL)
- have uncontrolled hypertension (>160/99 mm Hg)
- have cancer or in short-term remission (less than 3 years)
- have an infectious disease
- suffer from alcohol or drug abuse
- use tobacco and/or e-cigarette products on a regular basis
- taking medications known to affect energy expenditure and appetite
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Even protein intake Even protein Menu to provide 90 g of protein per day in an even distribution of 30 g at each meal. Skewed protein intake Skewed protein Menu to provide 90 g of protein per day in a skewed distribution of 10 g at breakfast, 15 g at lunch and 65 g at dinner.
- Primary Outcome Measures
Name Time Method Body Composition 8 and 16 weeks Determine the effects of two patterns of daily protein intake on changes in fat mass and fat-free mass during weight loss.
Diet Adherence 16 weeks Determine the effects of two patterns of daily protein intake on weight loss diet adherence and putative mediators (satisfaction, satiety, hunger, and reinforcing value of energy dense foods) of adherence.
- Secondary Outcome Measures
Name Time Method Change in bone turnover 8 and 16 weeks The effect of consuming two patterns of daily protein intake during weight loss on osteocalcin, alkaline phosphatase, acid phosphatase, and collagen cross-link molecules -- biochemical markers of bone formation and resorption
Barriers to weight control 1 hour Nominal Group Technique results providing an exhaustive list of barriers to weight control in overweight and obese women
Change in skeletal muscle protein breakdown 8 and 16 weeks The effect of consuming two patterns of daily protein intake on 3-Methylhistidine degradation, a biochemcial marker of skeletal muscle protein breakdown
Circulating carotenoid levels 8 and 16 weeks The effect of consuming two patterns of protein intake during weight loss on circulating carotenoid levels.
Relative reinforcing value (RRV) of food 8 and 16 weeks The effect of consuming two patterns of daily protein intake during weight loss on the RRV of energy-dense snack food
Plasma lipids 8 and 16 weeks The effect of consuming two patterns of daily protein intake during weight loss on lipid and triglyceride molecular speciation.
Trial Locations
- Locations (1)
USDA Grand Forks Human Nutrition Research Center
🇺🇸Grand Forks, North Dakota, United States