Eligibility Criteria:
Inclusion Criteria:
* Normal body mass index (18.5 kg/m2 to 24.9 kg/m2), weight \>/= 45 kg
* Normal blood pressure \</=120/80 mmH
* Fasting blood glucose of \<5.6 mmol/l
* Able to provide written informed consent before participating in the study.
* Able to communicate adequately to comply with the requirements of the entire study, i.e., able to eat test meal and provide breath samples.
Exclusion Criteria:
* Smokers.
* Individuals with any metabolic diseases (such as diabetes, hypertension etc).
* Individuals with known glucose-6-phosphate dehydrogenase deficiency (G6PD deficiency).
* Individuals with medical conditions and/or taking medications known to affect glycaemia (glucocorticoids, thyroid hormones, thiazide diuretics).
* Individuals who take any prescribed medication or dietary supplements which may interfere with the study measurements.
* Individuals who have any major organ dysfunction (eg. cardiovascular, respiratory, hepatic, renal, gastrointestinal) that may influence taste, olfaction, appetite, digestion, metabolism, absorption or elimination of test foods, nutraceutical or drug.
* Individuals with history of malabsorption due to mucosal disease, pancreatic disease, or other causes.
* Individuals with history of gastrointestinal disease or surgery (excludes appendectomy, hernia repair and anorectal disorders).
* Individuals who are allergic/intolerant to any of the test foods to be administered, or any of the following common food and ingredients: eggs, fish, milk, peanuts, tree nuts, shellfish, soya, wheat, gluten, cereal, fruits, dairy products, meat, vegetable, sugar and sweetener, natural food colourings or flavourings, sulphites etc.
* People who intentionally restrict food intake.
* People who consume excessive 13C rich products such as corn, sugar beet and pineapple.
* Individuals who partake in sports at the competitive and/or endurance levels
* Individuals who have any known chronic infection or known to suffer from or have previously suffered from or is a carrier of Hepatitis B Virus (HBV), Hepatitis C Virus (HCV), Human Immunodeficiency Virus (HIV).
* Individuals who is a study team member or an immediate family of any study team member.
* Individuals who consume Excessive alcohol: consuming \>/= 6 alcoholic drinks per week.