These numbers are taken from this site:
NICE recommended target blood glucose level ranges
Target Levels
by TypeBefore meals
(pre prandial)2 hours after meals
(post prandial)
Non-diabetic4.0 to 5.9 mmol/Lunder 7.8 mmol/L
Type 2 diabetes4 to 7 mmol/Lunder 8.5 mmol/L
Type 1 diabetes4 to 7 mmol/Lunder 9 mmol/L
Children w/ type 1 diabetes4 to 8 mmol/Lunder 10 mmol/L
NB: There are differing opinions about the ideal blood glucose level range.
As suggested by Brunneria, do "normal" diet testing and see how you go before cutting stuff out. As she rightly says, you may just need to trim down the odd spud, or piece of toast. You should be targeting the non-diabetic levels, although you may have some higher numbers to start with.
You need to test just before you eat, then 2 hours after your first mouthful to establish your pre and post prandial readings. It will vary from meal to meal depending on what you've eaten, drunk, if you're stressed, tired, have exercised and what will feel like a million other factors.
Just take your numbers and keep asking back on here if you need help with interpretation of either the numbers or what to do if you see a horrid score.
One final thing. You will note there are no scores up there under 4. For T1 diabetics and T2s taking certain drugs, going below 4 needs some attention to bring it up again. For most T2s and non-diabetics, seeing a figure under 4, provided we feel fine is absolutely no cause for concern. Lots of non-diabetics would see those figures often, if they tested.
Yet again, lots of info to take on board.