So to get back to the opening post, can we take 200 or even 210grams per day of carbs as the bottom end of a safe target band, for those who do not yet have T2 diabetes? Something for Joe Public to aim for?
Would ~99% of the population avoid type 2 diabetes on a diet such as the one in Mr Pots example, bar those of course that might naturally be susceptible anyway.
Well, I would say that 200g carbs a day is far more than many people can cope with in the long term - but that isn't based on anything more than speculation.
My body has never done well, even as a young fit teenager, on more than (guesstimating based on 35 year old memories) 100g carbs a day. That was a high carb day for me and used to make me feel very ill.
200g is far more than I have ever been able to cope with and would probably have seen me with T2 level blood glucose in my 20s.
Although of course, different people, male, female, tall, short, fit, active, or not, will all have completely different tolerances.
And we wouldn't be able to tell whether they were eating a damaging amount for a long time - probably decades.
Far better to err on the side of caution, IMO. And sweeping guideline amounts are always nonsensical to vast numbers of people.