About HAT

Welcome, and thank you for your interest in HAT!

The trial

  • HAT stands for Habitual diet and Avocado Trial.
  • HAT is a research project aimed to answer the question whether eating an avocado every day impacts energy balance and metabolism.
    There are four Universities participating in this trial: Tufts University, Loma Linda University, Pennsylvania State University, and UCLA.
  • Participation consisted of study visits over the course of SIX months inside and outside of the laboratory.
    Baseline and 6 month MRIs were used to measure abdominal fat.
    We recruited 1,008 men and women at least 25 years of age to participate and contribute to our project

To be eligible, participants must have met the following criteria:

  • BMI of at least 25 for women or at least 27 for men
  • Willing to undergo two MRI scans of your abdomen
  • Not pregnant, lactating, or have an intention of pregnancy during the trial
  • No significant body weight change in the last year

Lab Visits

  • Participants were asked to visit the lab eight times over the course of the trial (up to 90 minutes per visit) to complete questionnaires, vitals, and blood draws
  • Complete two MRI visits, each lasting less than one hour
  • Complete four telephone interviews throughout the trial (approximately 40 minutes)
  • Half of the participants were required to pick up trial items every two weeks (10 minutes)
  • Some participants were asked to complete computer tests, blood pressure tests, and/or provide fecal and urine samples

HAT Protocol and Design