READING SLIP · 2018

The paper on the table

Carbohydrate replacement of rice or potato with lentils reduces the postprandial glycemic response in healthy adults in an acute, randomized, crossover trial

Moravek, D., Duncan, A. M., VanderSluis, L. B., Turkstra, S. J., Rogers, E. J., Wilson, J. M., Hawke, A., & Ramdath, D. D. · 2018

Abstract-based reading · consulted October 17, 2026. A selected teaching example, not a systematic review or dietary recommendation. Full-text methods, funding, registration and risk of bias have not been assessed.

Study design
Acute randomized crossover study, with separate rice and potato groups.
Who took part
Two groups of 24 healthy adults.
Studied preparation
Cooked lentils replaced half the available carbohydrate from rice or instant potato; meals supplied 50 g available carbohydrate.
Compared with
Rice alone or instant potato alone.
Time frame
Single-meal, postprandial testing.
What was measured
Postmeal glucose and insulin responses.
Reported finding
All three potato–lentil mixtures lowered measured glucose response versus potato alone. Rice results varied with lentil type.
Uncertainty
The abstract does not provide confidence intervals for these contrasts. Lentil type and the food replaced matter.
What this cannot tell us
An acute glucose response in healthy adults does not establish long-term disease prevention. Half the carbohydrate is not necessarily half the meal by weight.
Read the source abstract ↗Bring lentil to the study table →All research-reading cards →

Is this an addition, or a substitution?

Draw the two meals before comparing their results. A study that replaces one ingredient answers a different question from a study that simply adds another food.

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Who took part? What exactly was prepared, compared, and measured? Which result remains uncertain? Keep those answers beside any claim you save. These are editorial reading prompts, not findings from the paper.

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Sources & further reading

  1. Moravek, D., Duncan, A. M., VanderSluis, L. B., Turkstra, S. J., Rogers, E. J., Wilson, J. M., Hawke, A., & Ramdath, D. D. · 2018

    The Journal of Nutrition, 148(4), 535–541. Two groups of 24 healthy adults compared rice or instant potato with mixtures in which lentils supplied half the available carbohydrate. All three potato–lentil mixtures reduced the measured glucose response relative to potato alone. Rice findings differed by lentil type. An acute response does not establish chronic disease prevention or an individualized dietary prescription.

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