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I haven't worked out my BMI (T am 5' 3" so I guessing I am a bit under weight for my height. My liver scan will tell me if all is well and if they don't find anything then I will start the diet; I don't think they can tell if you have a fatty liver from a normal scan but I will ask them when I go for the scan.
I only found I was diabetic when I went for a free NHS health check and was gobsmacked to find I was diabetic as was the DN when I went for my first visit. She was expecting someone larger! She couldn't believe that I had no symptoms as my glucose was 18.6mmol/L and my HbA1c was 10.4%
I think you should be very careful at your weight when considering the Newcastle Diet.There is a lot of research going on at the moment which has not filtered through to the practice level.I myself volunteered for a research project in which blood was taken and then DNA coded.The research was to try and establish whether there was a genetic basis for type 2 diabetes,so a family history was taken to be used in conjuction with the DNA coding.I found out that they were already finding families with a regular history of developing type 2 in middle age.My first thought was that this was poor nutrition and exercise patterns being passed on down the generations,but apparently not.They had also identified subsets with type 2 eg 25% of patients on a particular steroid treatment went on to develop type 2.
I knew someone who had gastric band surgery and went from 22 stone to 12 stone,losing her diabetic symptoms along the way.Through her I found out about a long running survey of gastric band patients.Apparently approx 75% lost their diabetic symptoms post surgery,however 25% had not,which sort of brings you back to the genetic research.
The Newcastle Diet quite often normalises fasting bloods by the end of the first week,so if you do try it I doubt you would need the full 8 weeks.