How white potato meals and meal timing affect blood sugar and appetite in adults
Official title: Interaction Between White Potato Consumption and Meal Timing on Glycemic Response, Subjective Appetite, and Energy Intake in Adults.
Run by Toronto Metropolitan University · NCT07230951 · Data updated 2026-11-12
This test will see if eating different types of white potato sides at breakfast versus other times changes blood sugar, hunger, and how much healthy adults eat.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years to 65 Years |
| Sex | All |
| Enrollment | 30 (estimated) |
| Sponsor | Toronto Metropolitan University Academic / other |
| Locations | 1 site (Toronto, Ontario) |
| Status | Recruiting |
| Started | October 30, 2025 |
| Main results expected | October 2027 |
| Study ends | October 2027 |
| Registry record updated | November 17, 2025 |
| Trial ID | NCT07230951 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Healthy adults aged 18–65 with a BMI of 18.5–24.9 kg/m2 who do not have diabetes or major medical conditions and who can consume the test meals are ideal candidates.
✕Probably not a fit
People with diabetes, gastrointestinal, liver or kidney disease, recent major medical events, significant recent weight change, use of medications that affect glucose or appetite, recent dieting, or those who skip breakfast are unlikely to benefit from participation.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This randomized, within-subject repeated-measures experiment compares six test breakfasts in which participants eat an egg omelette with different sides (oven-baked home fries, oven-baked white russet potatoes, deep-fried quick-serve fries, oven-baked fries, oven-baked cauliflower tots, or no side) on separate mornings in random order. Blood glucose will be collected continuously using a Dexcom G7 and subjective appetite ratings will be recorded at baseline and over the 120 minutes after the test meal. At 120 minutes participants will be offered an ad libitum lunch to measure subsequent intake, and food intake plus glycemic data will be tracked for the remainder of the day until bedtime. The design tests whether potato type and timing influence acute glycemic responses, satiety, and total daily energy intake.
Why it matters
Potential benefit: If successful, the results could help healthy adults choose potato types and meal timing to reduce blood sugar swings and curb overeating.
How similar studies have gone: Previous studies using glycemic-index foods and meal-timing with continuous glucose monitoring have shown mixed but promising effects on satiety and glucose control, while direct comparisons of multiple potato preparations by timing are relatively novel.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * 18 - 65 years * within the healthy body weight range \[body mass index (BMI) between 18.5 - 24.9 kg/m2\]. Exclusion Criteria: * have a previous diagnosis of diabetes and gastrointestinal, liver or kidney disease; * have had a major medical or surgical event within the past 6 months; * have had any significant weight fluctuation in the past 6-months; * are taking medication that may influence dependent measures; * are or have been on a diet within the past 6 months; * skip breakfast or are unable to consume test treatment food.
Where it's running
-
Centre for Urban Innovation (CUI-109), School of Nutrition, Toronto Metropolitan University
Toronto, Ontario, Canada Recruiting
Similar studies
Other studies for the same condition or treatment. Recruiting studies are listed first.
-
White potato meals and when you eat them: how timing changes blood sugar and appetite
This study tests how eating white potatoes with meals at different times affects blood sugar, hunger, and how much people eat later in healthy adults.
-
Chromium Picolinate for Appetite and Cravings in Overweight Adults
A remote 8-week program tests whether daily chromium picolinate helps reduce hunger and cravings in adults with BMI 25–31 who are overweight.
-
High-protein, high-fiber pre-fast meal effects on fullness and blood sugar during fasting
This test sees if eating a high-protein, high-fiber meal before a fasting period helps healthy adults feel fuller and keep blood sugar steadier than a low-protein, low-fiber meal.
-
Collagen supplement to improve quality of life, appetite and blood sugar in adults with overweight or obesity
This trial will try an 8-day collagen peptide supplement to see if it improves quality of life, appetite and short-term blood sugar control in adults aged 18–65 who are overweight or have obesity and feel their quality of life is low.
-
Short-term effects of ultra-processed foods on metabolism
This project will test whether a short-term diet high in ultra-processed foods versus a nutrient- and energy-matched low-UPF diet changes appetite and how much adults with BMI 18.5–30 eat.
-
Effects of eating dates on hunger and appetite in adults with Type 2 diabetes
This study tests if eating three Baghdad dates every day can help adults with Type 2 diabetes manage their hunger and appetite better over 12 weeks.
How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.