The study will have a randomised, non-blind, between-subjects, crossover design. The subjects will return for six test sessions. At three random sessions subjects will test the reference food and on the remaining three sessions they will consume the test foods (Diasip, Isocal, Protinex). The first test session will be a glucose test session (for subjects requiring glucose tests). The reference food will be anhydrous glucose (50 g) dissolved in 250 ml of water. The test foods will be portions of the nutritional formulas containing 50 g of available carbohydrates. Subjects who have previously taken part in GI studies at the CNRC and who have already completed three reference glucose tests will have to complete only the three test food sessions. However, they may be asked to do one, two or all three of the glucose tests if their previous test results are old (> 3 months) or are not within the required precision (CV <30%). This aspect will be at the discretion of the investigator and communicated to the participant at the time of briefing (before consenting).