This study is an open label, randomized controlled cross-over study~Research objectives:~To study the efficacy of diabetes-specific formula (Nutren Diabetes) in comparison with an isocaloric diet in the aspect of postprandial blood glucose and insulin response (baseline, 30, 60 and 120 minute).~To study the safety and tolerance of a diabetes-specific formula compared with an isocaloric diet in patients with type 2 diabetes mellitus~Statistical analysis method~Descriptive statistics: categorical data will be summarized as number and percentage, continuous data with normal distribution will be presented as means and standard deviations, and continuous data with non-normal distribution will be summarized as median, minimum and maximum.~Inferential statistics: Repeated Measure ANOVA from analyzing the difference of means from measuring fasting glucose and insulin more than two times.~Inferential statistics: Paired T-Test or Wilcoxon Matched pairs Signed Rank Test derived by analyzing the comparison between the means of two dependent groups.~Report of the difference between two categories by the difference of means with 95% Confidence Interval~Number of participant (subjects) and criteria for participation 30 participants by calculation formula of Frison and Pocock (1992) with STATA program.
Hypothesis: the diabetes-specific formula Nutren diabetes provides better postprandial glucose control in patients with type 2 diabetes when compared to the isocaloric diet.