Summer wrote (in post #68):
Her glucose went up to 242 7 hours after her morning shot. I asked the vet if I could increase her food at her two feedings because she was getting very hungry. I have only been giving her one 3 oz can in the morning and at night. He said I could try one and a half cans. I'm wondering if that is why is glucose went back up or if it had just been a while since her insulin shot. Shouldn't the glucose go down when it has been a while since the shot and the food?
With Vetsulin, typically at +7 hours after administration the effect of the dose pretty much peter's out. Here's an illustration of an 'ideal' response to Vetsulin for a feline diabetic:
As you can see, Vetsulin's typical duration in cats isn't great (lasts longer in dogs because their metabolisms are different).
Because Susie's not yet regulated her body isn't currently able to utilise the nutrients she eats hence the unusual hunger, and it's common to feed extra to unregulated cats - especially if they are underweight. A substantial feed is needed 30 minutes before insulin administration because Vetsulin typically hits hard and fast. Thereafter, it's OK to give smaller feeds, ideally before +7. The only time grub should be withheld completely (assuming the cat is not in low numbers) is in the two hour period prior to the preshot reading, since this should not be influenced by food.
Glucose gets into the bloodstream when food is digested at mealtimes and also from the liver between meals. The liver stores sugar in the form of glycogen and breaks it down into glucose again between meals to provide fuel for the body's metabolic processes (glycogenolysis). The liver can also synthesize 'new' glucose from the body's stores of fat and protein - a process called gluconeogenesis - and then release that to provide the body with fuel. Therefore, even if it's a long time after a meal has been eaten it is very much possible for BG levels to rise due to sugars released from the liver, especially when the insulin dose is wearing off.
Mogs
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