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OpenTrials
Active, Not Recruiting

NCT Number: NCT07606001

Yellow Potatoes and Carotenoids

This study will assess the effects of daily intake of yellow and white potatoes on plasma lutein and zeaxanthin concentrations. Skin carotenoid levels will be assessed using the Veggie Meter.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Conditions

Carotenoids

Age range

18 year–80 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Florida

Gainesville, Florida, 32611, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adults ≥ 18 years of age
  • Able to provide written consent in English
  • Baseline Veggie Meter score of ≤ 300
  • Willing to adhere to study procedures

Exclusion criteria

  • Baseline Veggie Meter score of >300
  • Potato allergy
  • Previously or currently being treated for intestinal disease, including irritable bowel syndrome, Crohn's disease, ulcerative colitis, celiac disease, or gastrointestinal cancer
  • Previous gastrointestinal surgery (e.g., gastric bypass, fundoplication, bowel resection)
  • Current cancer treatment
  • Current pregnancy; Vegetarian diet
  • Elite athletes or long-distance runners

Treatment and study plan

Yellow-flesh potatoes

Other

Participants will consume 250 g daily of yellow-flesh potatoes.

White-flesh potatoes

Other

Participants will consume 250 g daily of white-flesh potatoes.

Primary outcomes

  1. Plasma zeaxanthin

    Time frame: 28 days

    Plasma concentration of zeaxanthin

Secondary outcomes

  1. Plasma lutein

    Time frame: 28 days

    Plasma concentration of lutein

  2. Skin carotenoid content

    Time frame: 28 days

    Skin carotenoid content by reflection spectroscopy

Sponsors and collaborators

Lead sponsor

University of Florida

Other

Registry information

Official study title

Effects of Yellow Flesh Potatoes on Carotenoid Status

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
May 26, 2026
Registry last updated
Jul 20, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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