Ellie - I haven't time to write/read the thread in detail now but you really don't need to buy a meter! You haven't been diagnosed with anything - but your blood sugar levels are higher than normal and if they keep on increasing may ( not necessarily) lead to Type 2 diabetes. Don't get hung up on your levels - they will decrease if you follow diet guidelines. You haven't got diabetes! All you need to do is control your diet by reducing/eliminating sugars and most extra carbs, especially refined ones. There are plenty of carbs in foods that aren't pure carbs - like sweet corn, sweet potatoes, lentils, beans, bananas etc. True "low carbers" avoid all these - but this is unnecessary. You can do no harm and a lot of good in drastically reducing extra carbs such as bread, pasta, rice, potatoes, sugar, cakes, biscuits, pastries etc and let yourself have the occasional (or daily) bowl of muesli or porridge. You must increase your protein though otherwise you will get low blood sugar especially initially. If you are overweight then also drastically reduce fat but in any case no need to go high fat as in fried foods, lots of cream etc - just eat normal food with the fat that's in it - just as coldethyl says. I haven't followed any particular diet but followed suggestions from my son who wanted to build muslce - as i wanted to lose weight. I suffer from reactive hypoglycaemia ( some people have a tendency to this) and it hardly ever happens now because of what I eat. Sorry if this is garbled! A relative also had "pre-diabetes" although she is in her 80's and she reduced blood sugar by diet and exercise - she had hers checked now and again at docs.
We can tell you what to eat and what not to eat - and also it's not a question of absolutes - but quantities! You just need to stop spiking your insulin with too much sugar/carbs - as this leads to insulin resistance (where insulin is less effective at removing sugar from blood). I can tell you what I eat if you want!
Hurdity x