Effect of Two Diets With Different Content of Protein on Weight Loss in Adults With Metabolic Syndrome

Summary

Randomised clinical trial with a 6-month follow-up in Mexican adult men and women (20-65 years) with Metabolic Syndrome (MS). The sample size was calculated using a formula that compares two means, an alpha of 0.05 and a power of 95%. Based on these calculations, we established a baseline sample of 118 adults. For the diagnosis of MS, we used the classification from the International Diabetes Federation (IDF). 150 patients were screened; however, 32 were excluded because they did not meet the criteria. Doctors wrote down medical history; nutritionists conducted anthropometry (weight, height, and waist circumference); and nurses measured blood pressure and withdrew venous blood for determination of glucose, triglycerides, and HDL-cholesterol. After being randomly assigned to one of two groups, the control group received a diet with a lower protein content (0.8gr/kg body weight), and the intervention group received a diet with higher protein content (1.34gr/kg body weight). Both diets had equal amount of calories, were equivalent in the type of carbohydrate, and had a caloric restriction of 500 calories less.

For the intervention group, meal replacements were made with soy protein, and individualized menus, controlling the content of calories, protein, carbohydrates, and fat, had more control over the total amount of protein consumed daily. Used as a substitute for food, the protein-enriched drinks were prepared with 250ml of either milk with 1.5% fat or just water. For both groups, the calorie density of the diet was adjusted for the baseline metabolic rate of each participant with a restriction of 500kcal/day.

Conditions

• Metabolic Syndrome X
• Weight Loss

Interventions

OTHER

High protein diet

Group received a diet with higher protein content (1.34gr/kg body weight). Meal replacements (drinks and bars) and individualized menus, controlling the content of calories, protein, carbohydrates, and fat, had more control over the total amount of protein consumed daily. Participants consumed two, protein-enriched drinks, contributing to the daily protein intake along with conventional foods and two low-fat bars. For both groups (intervention and control), the calorie density had a restriction of 500kcal/day calories less than the resting metabolic rate (RMR) and were equivalent in the type of carbohydrate. Recommendations for exercise (e.g., walking, biking or jogging at least 30 minutes/day, 5 days per week).

OTHER

Low protein diet

Control group received a diet with a lower protein content (0.8gr/kg body weight). Conventional foods (such as fish, meet, vegetables, fruits, nutrs, beans, etc) were prescribed. Individualized menus, controlling the content of calories, protein, carbohydrates, and fat, had more control over the total amount of protein consumed daily. The calorie density had a restriction of 500kcal/day. Recommendations for exercise (e.g., walking, biking or jogging at least 30 minutes/day, 5 days per week)

Sponsors & Collaborators

• Mexican National Institute of Public Health

  lead OTHER_GOV

Principal Investigators

• Simon Barquera, PhD · Mexican Institute of Public Health

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Model

SINGLE_GROUP

Eligibility

Min Age

20 Years

Max Age

65 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2014-01-31

Primary Completion

2015-01-31

Completion

2015-03-31

Countries

• Mexico

Study Locations