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Active, not recruitingNCT05176197Updated Dec 12, 2023

Effects of Almonds on Glycemia in Adults With Elevated Hemoglobin A1c Concentrations

An interventional study of Almond and Control in Glucose Intolerance and Glucose Metabolism Disorders (Including Diabetes Mellitus), sponsored by Purdue University. Active, not recruiting at 1 site in United States. Open to participants aged 18 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-12-12.

Sponsored by Purdue University · Not applicable, Interventional, and Basic science

Phase
Not applicable
Study type
Interventional
Enrollment
84
Allocation
Randomized
Ages
18 Years to 70 Years
Sex
All
01

Study summary

This study will examine the effects of regular almond consumption by individuals with elevated HbA1c on long-term glycemic control.

Read the detailed description

Globally, it is projected that 418 million people will have impaired glucose tolerance by 2025. In the US, an estimated 34 million Americans have diabetes and 88 million, 33% of adults, have pre-diabetes. Impaired glucose tolerance is now manifesting in young adults where 20% of those 12-18 years of age have prediabetes. The current prevalence of Type 2 diabetes is over 8%, but it is projected that up to a third of Americans will develop diabetes in their lifetime. Additionally, the total annual cost of diabetes is approximately $327 which accounts for 25% of all US health care costs. Moreover, the costs rose 60% from 2007 to 2017 and this trend is continuing.

Diet is the preferred approach for management for this diet-related chronic disorder. Accumulating evidence suggests almond consumption decreases postprandial glycemia and may evoke a second meal effect, especially when they are consumed at breakfast or as an afternoon snack, which may aid in long-term glycemic control. Additionally, almond consumption can decrease total and LDL cholesterol, resulting in lower peripheral insulin resistance and cardiometabolic complications from type 2 diabetes mellitus. However, there is mixed evidence on the effects of almond consumption on HbA1c, a clinically important endpoint that provides a reliable measure of long-term glycemia and is correlated with risk of complications from diabetes. Thus, the investigators hypothesize a beneficial effect of regular almond consumption on long-term glycemic control in individuals with elevated baseline HbA1c.

02

Conditions studied

  • Glucose Intolerance
  • Glucose Metabolism Disorders (Including Diabetes Mellitus)
03

In context

Metabolic Diseases

997 studies on the registry are indexed under Metabolic Diseases; 234 are open to participants now.

This study's planned enrollment of 84 is above the median of 48 across 670 interventional studies indexed under Metabolic Diseases.

Browse Metabolic Diseases studies →

Lead sponsor

Purdue University is the lead sponsor of 168 studies on the registry; 23 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 70 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • HbA1c >5.7%
  • BMI >20 kg/M\^2
  • Prefer no use of medications, but if on medication, must have been on a stable dose for 3 months and plan to remain at the same level for the duration of the trial.
  • Healthy, good dentition
  • No nut allergies
  • >4.0 eating events per day
  • >=1 low nutrient density snack/d
  • No allergy to chocolate

Exclusion criteria

Exclusion Criteria:

  • HbA1c within normal range
  • BMI \<20 kg/M\^2
  • Nut allergies
  • Smoker
  • Pregnant
05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
84 participants (estimated)

Study arms

  • Experimental
    Almond Group

    Participants will consume almonds every day for 16 weeks, but will not be allowed to consume any other nuts or nut products.

    Other: Almond

  • Experimental
    Control Group

    Participants will consume pretzels every day for 16 weeks, but will not be allowed to consume any other nuts or nut products.

    Other: Control

Interventions

  • OtherAlmond

    Participants will consume almonds every day for 16 weeks.

  • OtherControl

    Participants will consume pretzels every day for 16 weeks.

06

What researchers measure

Primary outcomes

  1. HbA1c

    Time frame: Baseline

  2. Change in HbA1c

    HbA1c % change

    Time frame: 16 weeks

Secondary outcomes

  1. Glucose response to a meal tolerance test

    mg/dl

    Time frame: Baseline and week 16

  2. Insulin response to a meal tolerance test

    mmol/L

    Time frame: Baseline and week 16

  3. Chronic glycemia

    mg/dl

    Time frame: Baseline, week 8 and week 16

  4. Food intake

    kcal

    Time frame: Two days (one week day and one weekend day) at screening, week 8 and week 16.

  5. Body weight

    Kilograms (kg)

    Time frame: Screening, baseline, week 4, week 8, week 12, and week 16

  6. Body composition

    Percentage (%)

    Time frame: Baseline, week 16

  7. Hedonic survey

    mm on a VAS

    Time frame: Baseline, week 4, week 8, week 12. week 16

Other outcomes

  1. Compliance - Vitamin E

    mg/L

    Time frame: Baseline, week 8 and week 16.

  2. Compliance - fatty acid profile

    % fatty acid composition

    Time frame: Baseline, week 8 and week 16

07

Study locations

1 site
  • Purdue Univeristy
    West Lafayette, Indiana 47907, United States
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 12, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT05176197
Lead sponsor
Purdue University
Collaborators
Almond Board of California
Responsible party
Richard Mattes (Professor, Nutrition Sciences, Purdue University) — Principal investigator
First posted
Jan 4, 2022
Start date
Feb 9, 2022
Primary completion
Jul 30, 2023
Completion
May 30, 2024 (estimated)
Last update
Dec 12, 2023

Study contacts

Richard D Mattes, PhD
principal investigator · Purdue University

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is active, not recruiting, as verified in Dec 2023. You cannot join it, but the record below documents what was studied.

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