Dr Siti Rohaiza Ahmad


Assistant Professor, Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences


An Assistant Professor at PAPRSB Institute of Health Sciences. Her current research interests include the characterization of Bruneian rice and the use of local medicinal plants in diabetic patients in Brunei Darussalam (both projects has received grants from UBD, and herself as the Principal Investigator). Dr. Siti Rohaiza is also passionate about research in other nutrition-related projects and university education.


Bsc (Hons) Nutrition - University of Nottingham, UK
MSc (Biotech) - UOW, Australia
PhD in Public Health - UQ, Australia


General area of interest:-
1. Nutrition (Public health and laboratory research)
2. Obesity - the impact of the environment
3. University Education


Local Bruneian Rice Study: Health Impact and Product Development ( MARCH 2018-MARCH 2023)

Research involving characterization of local Bruneian rice such as Sembada, MRQ96, Laila etc. Looking at their nutritional composition and glycaemic index. The research also looked at the impact of cooking on calories and the anti-cancer property of selected local Bruneian Rice. Research is fully funded by UBD Competitive Grant (BND$35,000) and Dr Siti Rohaiza is the Principal Investigator.

Applications Invited
Searching for Master student to start in January 2023 (Master by Research)

Myth versus scientific evidence: effectiveness of selected local Bruneian herbs acting as supplement to control diabetes (JANUARY 2020 - JANUARY 2023)

Comparison will be made on traditional belief against scientific evidence on the efficacy of the mentioned medicinal plants on managing type 2 diabetes mellitus. Followed by in-depth experimental research on the best methods of extraction of these three local plants, to measuring the toxicity levels of the plants’ extractions. Followed by, studies on animal test subjects on the administrations of these medicinal plants to establish clear proof on best practice of consumption of these medicinal plants to establishing a clearer understanding of the effect of the medicinal plants on the management of type 2 diabetes in animal models. Research is fully funded by UBD Herbal Grant (BND$32,500) and Dr Siti Rohaiza is the Principal Investigator. Currently one PhD Student, Nazurah Hamizah Salleh (started January 2020) is undergoing her research under the project.

Applications Invited
Position for PhD student already filled

Scopus Publications


Google Scholar Citations


Google Scholar h-index


Google Scholar i10-index

Scopus Publications


Siti Rohaiza Ahmad (2022). Plant-Based Diet for Obesity Treatment. Frontiers in Nutrition. https://www.frontiersin.org/articles/10.3389/fnut.2022.952553/abstract

Siti Rohaiza Ahmad (2022). Vitamin C for COVID-19 Treatment: Have We Got Enough Evidence? Frontiers in Nutrition. https://www.frontiersin.org/article/10.3389/fnut.2022.892561

Zulkipli, I. N., Lee, S. H. F., Ahmad, S. R., & Lim, Y. C. The Use of Probiotic Therapy in Metabolic and Neurological Diseases. Frontiers in Nutrition, 783.

Idris, F., Zulkipli, I.N., Abdul-Mumin, K.H. et al. Academic experiences, physical and mental health impact of COVID-19 pandemic on students and lecturers in health care
education. BMC Med Educ 21, 542 (2021). https://doi.org/10.1186/s12909-021-02968-2

Salleh, N. H., Zulkipli, I. N., Mohd Yasin, H., Ja’afar, F., Ahmad, N., Wan Ahmad, W. A. N., & Ahmad, S. R. (2021). Systematic review of medicinal plants used for treatment of diabetes in human clinical trials: An ASEAN perspective. Evidence-Based Complementary and Alternative Medicine, 2021.

Rohaiza, Ahmad Siti, and Robert Bush. "Obesogenic Assessment of the Primary Schools Environment: A Qualitative Narrative Analysis." medRxiv (2020).

Bungsu I, Kifli N, Ahmad SR, Ghani H and Cunningham AC (2021) Herbal Plants: The Role of AhR in Mediating Immunomodulation. Front. Immunol. 12:697663. doi:

Ahmad, Siti Rohaiza. "Foods Consumed with Rice that Elicit a Reduction in Glucose Response among Healthy Individuals." Current Research in Nutrition and Food Science
Journal 8, no. 2 (2020): 630-639.


UBD Competitive Research Grant - Local Bruneian Rice Research as Principal Investigator (BND$35,000) - Until March 2023

UBD Herbal Grant - Myth versus scientific evidence: effectiveness of selected local Bruneian herbs acting as supplement to control diabetes as the Principal Investigator (BND$37,500) _ until December 2022


Nutrition related projects - Methodology