I have been eating VLCHF for over 4 months and at the 3 month mark I ad a c-peptide test done. I am producing more than twice as much insulin as normal. This is not uncommon in T2's but it is certainly not true for all. I believe there are many different reasons for T2 involving hormones, signalling, b-cell function, an other things. Some, like me, make to much insulin while being very insulin resistant, others do not make enough. Some, like me again, have a liver that does not seem to know when to stop dumping glucose, others do not have this issue. RH people spike too high then produce too much insulin too late and drop way too low. The only common denominator seems to be that restricting carbs at some level helps almost everyone. What that level is varies from person to person. I had Chinese takeout a couple weeks ago after months of low carb and spiked to 11 in an hour from a before meal reading of 5.8, a huge spike. At the 2 hour mark I was back at 5.8 so clearly my pancreas still knows what to do. I hope this helps.