Effects of Almonds on Insulin Sensitivity in Prediabetes

PreDiabetes Clinical Trial

Official title:

A Randomized, Crossover Trial to Assess the Effects of Replacing Refined Carbohydrates With Almonds on Insulin Sensitivity in Men and Women With Prediabetes.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03126981
• Other study ID #: MB-1701
• Status: Completed
• Phase: N/A
• Start date: April 20, 2017
• Est. completion date: September 26, 2018

Study information

• Verified date: July 2019
• Source: Midwest Center for Metabolic and Cardiovascular Research
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The goal of this clinical trial is to evaluate the effects of consuming 1.5 oz almonds twice daily on insulin sensitivity and markers of cardiometabolic health in men and women with prediabetes.

Description:

This is a randomized, controlled, two-period crossover study that includes two screening visits, and two 6-week test periods, separated by a 4-week washout. Subjects consume twice daily, 1.5 oz whole, natural almonds (Active Condition) or low-fat foods high in refined starches and added sugars, matched for energy content to the almonds (Control Condition). The assigned study products will be dispensed with instructions to consume 2 servings (Active Product) or 3 servings (Control Products) each day, starting on day 1. Subjects will be screened for prediabetes at the first screening visits. An intravenous glucose tolerance test (IVGTT) will be completed at baseline and the end of each treatment period. Fasting blood samples will be collected for lipid profile and high-sensitivity C-reactive protein (hs-CRP) measurements at all visits. Additionally, blood will be drawn for measurement of Apolipoprotein B and A1, lipoprotein particles and subfractions, Interleukin 6 (IL-6) and Uric acid at the beginning and the end of each test period. Assessments of vital signs, body weight, evaluation of inclusion and exclusion criteria, medication/supplement use, and adverse effects will be performed throughout the study. Compliance will be assessed through a daily log record, and return of unopened study product.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 54
• Est. completion date: September 26, 2018
• Est. primary completion date: September 26, 2018
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 69 Years

Eligibility

Inclusion Criteria:

1. BMI of 25.0-39.9 kg/m2

2. Prediabetic: fingerstick glycated hemoglobin 5.7-6.4% (inclusive), or fasting fingerstick capillary glucose of 100-125 mg/dL (inclusive), or 2-h post-prandial glucose of 140-199 mg/dL.

3. Fasting LDL-C level <200 mg/dL and fasting TG level <400 mg/dL.

4. Judged to be in general good health on the basis of medical history and screening laboratory tests.

Exclusion Criteria:

1. Atherosclerotic cardiovascular disease including any of the following: clinical signs of atherosclerosis: peripheral arterial disease, abdominal aortic aneurysm, carotid artery disease [symptomatic (e.g., transient ischemic attack or stroke of carotid origin) or >50% stenosis on angiography or ultrasound], history of myocardial infarction, angina, a revascularization procedure, or other forms of clinical atherosclerotic disease (e.g., renal artery disease).

2. History or presence of clinically important pulmonary (including uncontrolled asthma), endocrine (including type I or type II diabetes mellitus), chronic inflammatory disease (including irritable bowel disease, lupus, rheumatoid arthritis), hepatic, renal, hematologic, immunologic, dermatologic, neurologic, psychiatric, or biliary disorders.

3. Known allergy, sensitivity, or intolerance to any ingredients in the study foods.

4. Uncontrolled hypertension.

5. Recent history of cancer, except for non-melanoma skin cancer.

6. Recent change in body weight of ± 4.5 kg (9.9 lbs).

7. Recent use of any medications intended to alter the lipid profile (e.g. bile acid sequestrants, cholesterol absorption inhibitor, fibrates, niacin (drug form), omega-3-ethyl ester drugs, and/or PCSK9 inhibitors, with the exception of the stable use of statins), weight-loss drugs or programs, systemic corticosteroid drugs, unstable use of any antihypertensive medication; medications known to influence CHO metabolism (e.g. adrenergic receptor blockers, diuretics, and/or hypoglycemic medications).

8. Recent use of food/supplements known to influence lipid metabolism (e.g. omega-3 fatty acid supplements (e.g., flaxseed, fish or algal oils) or fortified foods, sterol/stanol products; dietary supplements (red rice yeast supplements; garlic supplements; soy isoflavone supplements; niacin or its analogues at doses >400 mg/d, and irregular or inconsistent use of Metamucil® or viscous fiber-containing supplements.

9. Recent use of antibiotics.

10. Pregnant, planning to be pregnant during the study period, lactating, or is of childbearing potential and is unwilling to commit to the use of a medically approved form of contraception throughout the study period.

11. Extreme dietary habits (e.g. very low CHO diet, vegan, etc.).

12. Current or recent history, or strong potential, for drug or alcohol abuse.

13. History of a diagnosed eating disorder. -

Related Conditions & MeSH terms

• Glucose Intolerance
• Insulin Resistance
• PreDiabetes
• Prediabetic State

Intervention

Other:
• 1.5 oz of whole, natural almonds
1.5 oz of whole, natural almonds
• Low-fat, high refined starches/sugars
Low-fat foods, high in refined starches and added sugars

Locations

Country	Name	City	State
United States	MB Clinical Research	Boca Raton	Florida
United States	Illinois Institute for Food Safety and Health (IFSH) at Illinois Instiute of Technology (IIT)	Chicago	Illinois

Sponsors (2)

Lead Sponsor	Collaborator
Midwest Center for Metabolic and Cardiovascular Research	Almond Board of California

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Insulin sensitivity index (SI)	SI from a short (50-min) intravenous glucose tolerance test (IVGTT) at baseline(day 0) and end of two treatment periods (day 43 of both treatment periods)	43 days for each treatment period.
Secondary	Fasting lipoprotein lipids	Fasting blood samples will be collected for measurements of lipoprotein lipids including: Total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), non HDL-C, TC/HDL-C ratio and triglycerides (TG) at all visits.	Up to 43 days for each treatment period.
Secondary	Apolipoprotein (Apo) B and A1, Lipoprotein subfractions and particles	Fasting blood samples will be collected for measurements of Apo B1 and A1, and lipoprotein subfractions and particles at baseline (day 0) and end of the two treatment periods (day 43)	43 days for each treatment period
Secondary	high-sensitivity C-reactive protein (hs-CRP)	Fasting blood samples will be collected for measurement of hs-CRP at all visits.	Up to 43 days
Secondary	Serum Uric acid	Fasting blood samples will be collected to measure serum Uric acid levels at the beginning and end of each treatment periods.	43 days for each treatment period
Secondary	Interleukin-6 (IL-6)	Fasting blood samples will be collected to measure serum IL-6 levels at baseline (day 0) and the end of the two treatment periods (day 43)	43 days for each treatment period