Two minutes and a set of scales, and you'll know whether the first meal of your day is fuelling you or quietly setting you up for the 11am crash.
Kitchen scales and the breakfast you actually ate, not the one you meant to eat. There's a short guide on weighing inside if you want it.
Check my breakfastFree, and there's nothing to install. I'll ask for your email at the end so I can send the result over.