Almond Consumption and Glycemia

NCT ID: NCT03236116

Last Updated: 2021-01-07

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

75 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-08-01

Study Completion Date

2020-12-31

Brief Summary

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This study will examine the effects of almonds consumed by adults with different body fat distributions on indices of carbohydrate and lipid metabolism.

Detailed Description

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There is considerable evidence supporting a causal role for truncal visceral fat depots in glucose dysregulation. Individuals with large visceral fat depots have impaired suppression of free fatty acid release in response to insulin, elevated triglycerides and low concentrations of high density lipoprotein cholesterol. The high free fatty acid concentration may induce insulin resistance in the muscle and liver. There is more recent evidence that truncal subcutaneous fat depots are also problematic, though this literature is mixed. In contrast, gluteo-femoral fat depots have not been implicated in insulin resistance and dysregulation of carbohydrate metabolism. Failure to account for differences in the contributions of these depots will add noise to measurements of dietary interventions to mitigate glucose dysregulation. Previous studies have reported evidence indicating acute and chronic consumption of almonds improves glycemia. Acute effects are important indicators of health benefit, but longer-term trials, ones permitting identification of the effects of a dietary intervention on HbA1c, are more telling and clinically relevant. To more definitively establish the association between almond consumption and improved carbohydrate metabolism, we propose a six-month trial that contrasts the effects of almond consumption at optimal times of the day versus consumption of low nutrient dense snack foods on indices of carbohydrate metabolism, food intake and appetite in adults characterized by three distinct fat depots.

Participants will consume either almonds, or no nuts every day for 6 months. At baseline, participants will be weighed and undergo a DEXA scan to determine body fat composition and will be assigned a group. Blood will also be collected fasted and at stipulated times in response to a meal tolerance test to measure insulin, glucose, C-peptide, HbA1c, lipid panel, gut peptides, and compliance to the diet. Participants will be given links to complete appetite ratings and record food intake. Participants will report to the lab every two weeks to be weighed, and get a resupply of almonds (if in the almond group). At the two-week mark on months 2 and 4, participants will be weighed, blood will be taken to assess compliance to the diet, and links will be given to complete appetite ratings and record food intake. At month 6, all measurements from baseline will be repeated.

Conditions

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Glucose Intolerance Appetite Disorders Glucose Metabolism Disorders (Including Diabetes Mellitus) Lipid Metabolism Disorder

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

NONE

Study Groups

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Almond Group

Participants will consumed almonds every day for 6 months, but will not be allowed to consume any other nuts or nut products.

Group Type EXPERIMENTAL

Almonds

Intervention Type OTHER

Participants will consume almonds everyday for 6 months.

Control Group

Participants will continue with their normal eating routine for 6 months, but will not be allowed to consume any nuts or nut products.

Group Type EXPERIMENTAL

Control (no nuts)

Intervention Type OTHER

Participants will not be permited to consume any nuts for 6 months.

Interventions

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Almonds

Participants will consume almonds everyday for 6 months.

Intervention Type OTHER

Control (no nuts)

Participants will not be permited to consume any nuts for 6 months.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Meeting one of the following body fat distribution criteria determined by DEXA: 1. High visceral fat 2. High gluteo-femoral fat 3. High truncal subcutaneous fat
* 18-60 years
* no nut allergies

Exclusion Criteria

* Not meeting one of the body fat distribution criteria
* allergic to nuts
Minimum Eligible Age

18 Years

Maximum Eligible Age

60 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Almond Board of California

OTHER

Sponsor Role collaborator

Purdue University

OTHER

Sponsor Role lead

Responsible Party

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Richard Mattes

Professor, Nutrition Sciences

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Richard D Mattes, PhD

Role: PRINCIPAL_INVESTIGATOR

Purdue University

Locations

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Indiana University School of Medicine

Indianapolis, Indiana, United States

Site Status

Purdue University

West Lafayette, Indiana, United States

Site Status

Purdue University

West Lafayette, Indiana, United States

Site Status

Countries

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United States

Other Identifiers

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055-047

Identifier Type: -

Identifier Source: org_study_id

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