I'd been ratty for years, and am much better since I got my BG down. I did have one occasion early one where I got ratty while trying to find something for lunch. It was a combination of BG getting lower, and no low carb options in any of the many food outlets in the shopping centre where we were. Not had it again since, and am now more chilled about adapting non low carb options, for example getting a burger and eating it without the bread.