In this study, participants will receive, in randomized, double-blind fashion, an intragastric bolus administration of either (i) 300 mg quinine, (ii) 5 g L-isoleucine, (iii) a combination of (i)+(ii), or (iv) control, before 350 ml (500 kcal) of a mixed-nutrient drink, to evaluate the effects on postprandial blood glucose, gastric emptying, and the hormone, and appetite, responses to the mixed-nutrient drink. Study visits will be separated by 3-7 days and participants will receive one treatment per visit.

On each study visit, the participant will be intubated with a nasogastric feeding tube. At t= - 60 min (08:30 am), a baseline blood sample, visual analogue scale questionnaire (VAS), and breath sample will be collected and quinine or control will be administered through the feeding tube. 30 min later (at t= - 30 min), L-isoleucine or control will be administered over 2 min after which the feeding tube will be removed immediately. At t = -45, -30, -15, and -1 min further blood samples will be collected and VAS completed. At t = -1 min, participants will consume, within 1 minute, a mixed-nutrient drink, labeled with 100 mg of 1-13C-acetate for measurement of gastric emptying by breath sampling. Blood samples, VAS, and breath samples will be taken at regular intervals between t = 0-180 min.

This trial aims to assess the effects of intragastric administration of quinine, combined with L-isoleucine, on postprandial blood glucose, gastric emptying, gut and gluco-regulatory hormones, as well as appetite perceptions in response to a mixed-nutrient drink.

Each participant will be studied on 4 occasions, separated by 3-7 days. Participants will receive, in randomized, double-blind fashion, an intragastric bolus of (i) 300 mg quinine, (ii) 5 g L-isoleucine, (iii) combination of (i)+(ii), or (iv) control. Due to the low water solubility, L- isoleucine will be provided as a suspension using 5 ml of 'the suspending agent' Ora-Plus (manufactured by Perrigo, Minneapolis). Visits will be carried out at the Clinical Research Facility, Adelaide Medical School, University of Adelaide, by staff and students trained in the required clinical research techniques.

Participants will consume a standardized dinner meal (400g McCain's beef lasagne) the night before each study visit by no later than 7 pm. After fasting for 13.5 hours overnight and refraining from alcohol and exercise for 24 hours, participants will arrive at the Clinical Research Facility by 8:30 am. Upon arrival, participants will be intubated with a nasogastric, custom-built soft silicon feeding tube (outer diameter: 4mm; Dentsleeve, Mississauga, Ontario, Canada) that will be inserted through an anaesthetized nostril and placed in the stomach. An intravenous cannula will be placed into a right forearm vein for regular blood sampling. At t = -60 min, a venous baseline blood sample (6 ml) will be collected and the participant will complete a visual analogue scale questionnaire (VAS) to assess appetite-related perceptions (fullness, hunger, desire to eat, prospective food consumption) and GI symptoms (nausea and bloating). Immediately thereafter, the participant will receive a 10- ml intragastric bolus of either 300 mg quinine-hydrochloride (Q-HCl) or water (control), and 30 min later, at t -30 min, an intragastric bolus of L-isoleucine (100 ml suspension consisting of 5 g L- isoleucine, 5 ml Ora-Plus and 90 ml 0.9% saline) or control (5 ml Ora-Plus and 95 ml saline) over 1 min after which time the catheter will be removed immediately. At t = -1 min, the participant will consume, within 1 min, a mixed-nutrient drink (Nestle, 500 kcal, 350 ml, 56 g carbohydrates) labelled with 100 mg of 1-13C-acetate for measurement of gastric emptying by breath sampling. Breath samples will be collected in sealed breath bags at baseline (prior to quinine administration) and at regular intervals between t = 0-180 min, for subsequent analysis of 13CO2 concentration in exhaled breath. Blood samples for the measurement of glucose and plasma concentrations of hormones will be taken regularly (12 sampling time points in total), and participant complete VAS questionnaires. At I = 180 min, after final blood and breath samples and VAS measurements, the intravenous cannula will be removed and the participant will be served a light lunch, after which they will be allowed to leave the laboratory.

Inclusion Criteria:

• Lean weight (BMI 19-25 kg/m2)

Exclusion Criteria:

• Significant gastrointestinal symptoms, disease or surgery;
• Current gallbladder or pancreatic disease;
• Cardiovascular or respiratory diseases;
• Any other illnesses as assessed by the investigator (including chronic illnesses not explicitly listed above);
• Use of prescribed or non-prescribed medications (including vitamins and herbal supplements) which may affect energy metabolism, gastrointestinal function, bodyweight or appetite (eg domperidone and cisapride, anticholinergic drugs (eg atropine), metoclopramide, erythromycin, hyoscine, orlistat, green tea extracts, Astragalus, St Johns Wort etc.);
• Individuals with low ferritin levels (less than 30 ng/mL), or who have donated blood in the 12 weeks prior to taking part in the study;
• Lactose intolerance/other food allergy(ies);
• Vegetarians;
• Restrained eaters (score >12 on the three-factor eating questionnaire);
• Current intake of greater than 2 standard drinks on greater than 5 days per week;
• Current smokers of cigarettes/cigars/marijuana;
• Current intake of any illicit substance;
• High performance athletes;
• Inability to comprehend study protocol;
• Unable to tolerate naso-gastric tube

The datasets generated during and/or analysed during the current study are not publicly available due to the ethical statement and informed consent that require privacy of data.

In order to blind both investigator and participant, the treatments will be prepared on the morning of each study day, and filled in covered syringes, by a research officer who will have no involvement in data analysis.