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How long after eating does it take for a cat's stomach to be empty? A medication my cat needs to take suggests that it be given on an empty stomach. My cats a grazer and I don`t want to starve him (he is fed every 4 to 5 hrs, and usually takes up to 1.5 hrs each meal to finish) as he`s lost a tremendous amount of weight. So, basically I`m trying to find out how long... show more A medication my cat needs to take suggests that it be given on an empty stomach. My cats a grazer and I don`t want to starve him (he is fed every 4 to 5 hrs, and usually takes up to 1.5 hrs each meal to finish) as he`s lost a tremendous amount of weight.
It takes only seconds for physical food to reach the physical stomach. However, the feeling of fullness is not determined by the filling of the stomach, but by an increase in blood sugar, which tells the brain you no longer need food. 20 minutes is the average time that this takes for a meal that includes some fat, some carbs and some proteins. If it is a protein only meal or one that is high in fat, it can take 40 minutes to an hour because the stomach must first digest the proteins into useable carbs before sending them to the bloodstream. Only then does the blood sugar rise and signal full to the brain.