For weight loss, anything up to 100g carbs is considered low carb, as per Mark Sisson from Primal Blueprint. See his carbohydrate curve here: http://www.marksdailyapple.com/the-primal-carbohydrate-continuum/#axzz3epEUaI5n
However, for controling diabetes, everyone has to find their own sweet spot. Mine seems to be around 30, maybe up to 40 - but that is just for controlling BG after meals. I still have elevated fasting BG, and hope that losing weight and exercise will help.
Hi Robbity thanks for the reply very interesting. You mention ketosis I thought this was dangerous ?