NCT07606001

Brief Summary

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.

Trial Health

77
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
30

participants targeted

Target at below P25 for not_applicable

Timeline
6mo left

Started May 2026

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress9%
May 2026Dec 2026

First Submitted

Initial submission to the registry

May 18, 2026

Completed
8 days until next milestone

First Posted

Study publicly available on registry

May 26, 2026

Completed
2 days until next milestone

Study Start

First participant enrolled

May 28, 2026

Completed
3 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

August 31, 2026

Expected
4 months until next milestone

Study Completion

Last participant's last visit for all outcomes

December 15, 2026

Last Updated

June 11, 2026

Status Verified

May 1, 2026

Enrollment Period

3 months

First QC Date

May 18, 2026

Last Update Submit

June 9, 2026

Conditions

Carotenoids

Keywords

luteinzeaxanthincarotenoidpotatoes

Outcome Measures

Primary Outcomes (1)

  • Plasma zeaxanthin

    Plasma concentration of zeaxanthin

    28 days

Secondary Outcomes (2)

  • Plasma lutein

    28 days

  • Skin carotenoid content

    28 days

Study Arms (2)

Yellow-flesh potatoes

EXPERIMENTAL

250 g of yellow-flesh potatoes

Other: Yellow-flesh potatoes

White-flesh potatoes

PLACEBO COMPARATOR

250 g of white-flesh potatoes

Other: White-flesh potatoes

Interventions

Yellow-flesh potatoesOTHER

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

Yellow-flesh potatoes
White-flesh potatoesOTHER

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

White-flesh potatoes

Eligibility Criteria

Age18 Years - 80 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

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

You may not qualify if:

  • 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

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

University of Florida

Gainesville, Florida, 32611, United States

RECRUITING

Central Study Contacts

Wendy J Dahl, PhD

CONTACT

352-294-3707wdahl@ufl.edu

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
OUTCOMES ASSESSOR
Purpose
OTHER
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

May 18, 2026

First Posted

May 26, 2026

Study Start

May 28, 2026

Primary Completion (Estimated)

August 31, 2026

Study Completion (Estimated)

December 15, 2026

Last Updated

June 11, 2026

Record last verified: 2026-05

Locations

US(1)