This randomized crossover study compares gastric residual volume after ingestion of carbohydrate drinks and water in obese volunteers. The main question\[s\] it aims to answer are: * Is it safe for obese patients to shorten their fasting by allowing preoperative drinks? * How long is the gastric emptying time in obese patients? Participants also will be evaluated the level of thirst/hungry and blood sugar.
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gastric residual volume
Timeframe: baseline and every 30 minutes until 2 hours after drinking