As has been said many times before, there are many things which can affect our blood sugars including food, drink, exercise, stress, illness, vaccines, ...
So, yes, the covid jab may raise your blood sugars.
If you take a search (using the field in the top right of every page), you will see a number of threads discussing this.
The reactions have been varied - some see a rise, some see a fall and some see no impact. Another example of how we are all different.
It is a shame that doctors do not share something like this with us when we are diagnosed to help us understand and manage our condition
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