Now when you want to maintain good health, high peaks, high spikes in blood glucose and the insulin response that provokes is not a very good thing, and so the red line is a far healthier way to be than the yellow line is.
They underlined that their intelligence services agreed on how far the Iranians had got with their programme but Mr Netanyahu made it clear his redline was Iran getting enough depleted uranium to be able to build a bomb whereas the president's is Iran actually deciding to build the bomb and getting near to achieving it.
And so despite my status as a running refusenik, I found myself herded, among a crowd of far fitter, healthier, sportier types, into a pen behind the start line, part of a sea of red t-shirted runners beneath a threatening gray sky.
