A Study of Plant-based Diet on Postprandial Sleepiness

Effect of Plant-based Diet on Postprandial Sleepiness

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT05706649

Enrollment

Registered

2023-01-31

Start date

2023-01-31

Completion date

2023-04-10

Last updated

2023-06-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Drowsiness

Keywords

Postprandial Sleepiness

Brief summary

This research aims to develop a better understanding and clinical knowledge of the effects of a plant-based diet on postprandial sleepiness.

Interventions

BEHAVIORALPlant-based diet

21 day diet that excludes any form of meat and other animal products, including dairy products.

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

OTHER

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to 70 Years

Healthy volunteers

Yes

Inclusion criteria

* Sleepiness after eating lunch. * ESS score ≥3 for answering the question about these two situations: 'sitting quietly after lunch without alcohol' and 'lying down to rest in the afternoon when circumstances permit'.

Exclusion criteria

* Diabetes. * Pregnancy or lactation. * Current use of a vegan/plant-based diet * BMI ≤ 22. * Iron deficiency. * Vitamin B12 deficiency.

Design outcomes

Primary

Measure	Time frame	Description
Change in postprandial sleepiness	Baseline, 21 days	Measured by Epworth Sleepiness Questionnaire before and after a plant-based diet. The Epworth sleepiness scale (ESS) is an 8 item questionnaire that measures daytime sleepiness in participants. Possible scores range from 0-24, with higher scores indicating a higher average sleep propensity in daily life, and a worse outcome.

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026