Official advice is still fixated on low calorie, which never worked for me or for many others. I think the Newcastle Diet smuggles in low carb by describing it only as "low calorie". And the results from the original trial were reported in a very misleading manner - they kept eliminating everyone who'd dropped out of the trial to inflate the "success" figures.
This is what I posted on the subject in 2024 - I still can't find the thread on the study itself:
There is a much longer thread on the research (and its very low success rate) somewhere on the forum - can't find it at the minute. I notice that the study published in the Lancet again muddies the waters by omitting from the percentage calculations the 45% of the sample who dropped out of the trial part way through and only reports "success" against the people completing it. So - out of 1740 who started, 945 completed the programme and, of these, 145 had two HbA1c measures of less than 48. That's just over 8% of the starting group.