@Andrew_Kennedy Hi Andrew,
I am also a type 1 diabetic (20 years). I have been on liquid food for well over a year now due to having mild gastroparesis, it has made my blood sugars better but not great. So i am now trying out Huel to see if the lower carbs helps. I also want to lose some weight which, when being insulin resistant isn’t easy as I take a higher does than most people.
I have had to change over to Huel at a slow rate as my diabetes likes to react to any change, however a spike after a meal is normal (even non-diabetics people have a blood sugar spike as high as 10 up to an hour after food) You could try taking you insulin after you have ‘eaten’ as it may be that you are having a dip in your BG while you are digesting the Huel and then the insulin is running out before you have finished digesting it.
As for the needing to eat, that is normal and I suffer with this greatly, it takes about 20-30 minutes for your brain to register that your stomach is full so you will still get the craving to chew till after that point. The sensation of chewing also lets your brain know that it needs your stomach to start digesting food, try chewing some gum after you have eaten it should reduce the need for wanting to munch on something solid.