But the problem is that if you were not overweight to start with and followed this diet then you would lose too much weight. Believe me I am a low carber and I have problems not losing too much weight, and if your bmi was ok then I think it would be unsustainable to do the newcastle diet. Believe me I wish i could do it I would love to reactivate my pancreas but I can't afford to lose any more weight, 5'8" and 60 kgs, before I was diagnosed as prediabetic I was slim but had to work at it, now I low carb I find it hard to maintain my weight.