I do keep a food diary as I need to know my carb intake and what foods are good/bad. I find Myfitnesspal is a app great for tracking the good, bad and the ugly when it comes to food as well as measuring quantities wherever possible. Unfortunately though my BS readings do still throw up unexplained highs especially first thing which to me just seems to be a weird feature of my diabetes. It is not really a "pattern" but just an unexplained irregularity and looking at the results of others on here I am not alone in those irregularities. One day maybe I will crack the reason but until then I will continue to be baffled.