I'm a firm believer in and LCHF diet, as it's carbs that turn to glucose (and also apparently make us fatter!) when we eat them, so for me it's been a matter of reducing their consumption to the lowest level that I can happily
and healthily sustain long term. But it's something that we have to work out for ourselves, as it's not a simple matter of one size fits all! My body is happy with a range of 30-50g carbs a day, and using my meter confirms that at this level I can (under normal circumstances!) keep my glucose levels steady and at a close to normal low level.
I agree with
@Bluetit1802 - in that it's a kind of balancing act between carbs and fats. Protein should remain fairly steady as it's the repair and building blocks for your body and shouldn't need much adjusting - though eating too much can also raise glucose levels. Carbs or fats are your body's fuel source, and you need enough of one or the other to keep you (and your brain!) in good working order. So reduce the carbs and increase the fats and oils enough to feel comfortably full after your meals. For finer tuning you can then add or decrease fats to gain or lose any weight that you may need to. There are a number of low carb nutritional calculators online to work out suitable percentages for your particular requirements if that will help make decisions easier - e.g.
http://www.phlaunt.com/diabetes/DietMakeupCalc.php.
I try to eat/drink as wide a variety of fats and oils as possible - from different sources: fattier meat & bacon, poultry, oily fish (salmon, trout, mackerel, sardines, tuna), dairy - real butter, full fat cream, cheeses & yoghurt, eggs, nuts & seeds including coconut, together with their oils and butters, olives & olive oil, avocados...
You don't
need to eat salads, but the "eating your greens" part of LCHF is important so make sure that you have at least some green above ground vegetables in your diet as they are a good source of essential vitamins and minerals.
And if you continue to have issues with metformin, ask for the SR (slow release) form as it's usually kinder to the body.
Robbity