Explain Dangerous ??????????
Simple. Your morning reading is supposed to be your fasting blood glucose, or pretty much your lowest reading of the day. If you're telling people that a reading of 11 isn't bad, you're going to discourage those people from aiming for a normal blood sugar reading. To be honest, even 7 is a bit high for an FBG (personally I aim for under 6).
We can't keep telling ourselves these readings are fine if we're serious about avoiding complications.
Porridge for me leaves me at about 6 - 7 two hrs after and is perfect before my running or cycling.
Yes, but we aren't talking about you. We're talking about someone who has a significant spike from 1 piece of toast, which is probably less than 20g of carbs. A bowl of porridge probably has nearer 30g. Someone having issues with less than 20g of carbs is likely to have worse issues with 30g.
Sorry something else that worries me - High in fat ?? surely it is all about a balanced healthy low fat way of life as well!
Why is high fat bad?
Fat isn't converted to fat, provided you metabolise it. If you metabolise it, it won't contribute at all to any of the supposed bad things that fat does. It doesn't even raise your blood sugar. If I metabolise 2500 cal a day, and I eat 2000 cal of fat, I'd be extremely surprised to get any major health issues related to obesity. Furthermore, eggs will contain far more vitamins and minerals than breakfast cereals, which have to be artificially fortified to give them any nutritional value beyond calories.
ALL blood sugar spikes (be they from protein or carbs) are converted to fat. Any time your BG goes over a certain parameter (generally somewhere between 7-8 mmol/l, ie. high blood sugar), whatever doesn't get used by your muscles gets converted by insulin to fat.
More interestingly, if you eat more fat and less carbohydrate, your triglyceride level will actually drop. Trigs tend to be the main cause of CVD/CHD.
As you say, we all need to test and find what works for ourselves. But let's not rule out any particular food group.