Thank you for posting that research.
I find it interesting that pre-5:2 I was low carbing and one thing I found difficult with low carbing was that I have a history of hypoglycaemia which when it would strike I would suffer the perspiration, palpitations etc and I was worried that I would suffer hypoglycaemia when fasting. Interestingly enough I have not had a full blown hypoglycaemic attack while 5:2ing. When I started fasting I did have to have an afternoon snack (of vege sticks and hoummus) and a dinner. With some practice I can now go from dinner to dinner fasting with no problems.
Just this morning I was thinking about how I didn't eat porridge as oats were a food that really sent my blood sugar crashing (about two hours after eating them I would want to fall asleep). So, I am now wondering if I should be brave and see if I can now eat porridge.
For me the whole eat small amounts often to keep your blood sugar stable just didn't work. I find it interesting that my blood sugar on normal eating days is nice and stable and I can't remember the last time I had a problem. Generally speaking I don't snack on eating days I just stick to my main meals.