Gestational diabetes mellitus (GDM) is a common condition during pregnancy that increasesthe risk of adverse maternal and birth outcomes. Effective dietary management isessential, but practical and structured tools to support nutrition counselling in routinecare are limited.This study aims to evaluate the effectiveness of the M-FIGO Nutrition Checklist andModule, a culturally adapted nutrition tool developed for use in Malaysia, among womendiagnosed with GDM.In this randomized controlled trial, pregnant women with GDM attending selected maternaland child health clinics were assigned to either an intervention group receiving theM-FIGO Nutrition Checklist and Module alongside standard care, or a control groupreceiving standard antenatal care alone. The intervention focuses on improving dietquality, including appropriate carbohydrate choices and portion sizes.The primary outcome is gestational weight gain, while secondary outcomes include bloodglucose control and birth outcomes. The findings of this study will provide evidence onthe effectiveness of a structured nutrition intervention in improving maternal andneonatal health among women with GDM.