Demeter:
*shrug* I live a LCHF lifestyle and practice intermittent fasting regularly. It's working fine for me and my cholesterol and blood sugar levels are normal for the first time in 15 years. I am insulin resistant and after struggling for years to lose weight, it is finally starting to come off. The rest of my meals are perfectly nutritious and I manage to hit all my macros daily. Personally I fail to see how a carb-laden (and by that I mean wholegrains, fruit and dairy) breakfast is any healthier than this for me. :P Sorry, I don't want to go on a massive rant about keto but yeah, what works for some might not work for others.
Common sense should tell you that anything that reddit is the major source of knowledge on is probably not backed by a lot of science. You could just have an egg for breakfast. Or even bacon and eggs. Funny thing is but many people know and have always known that you only need a big carb breakfast if you're going to perform a lot of manual labour. And the thing about breakfast cereals is that they're the perfect marketing vehicle for all sorts of things, from sugar to the All Blacks.