I asked this on my weight training forum a while back and the answer given was that you would have to take 300g per day of protein for it to be a problem...
So not a problem for most of us...........
The Keto calculator is good and gave me a range for protein of 110-180 grams per day, depending on how much training I do...
Be wary of this. As a diabetic your reaction to protein and gluconeogenesis (GNG) is not the same as that of a non-diabetic. I've spent a long time looking at this over the past year and have documented my thoughts throughout the forum.
Speaking from a T1 perspective, my sample of n=1, whilst eating a diet where there was 200g-250g of protein a day (which amounted to 40%-50% of my daily calorie intake) I saw a very pronounced GNG effect. If I ate a meal the bolus would account for an initial jump, that I believe can be attributed to a glucagon release in response to an expected insulin release that doesn't occur in diabetics. What I then see is, over a 1-3 hour period, a steady increase in blood glucose levels, which I believe is GNG taking place. I wrote a post
here about accounting for this effect using MDI.
In a non-diabetic, the beta cells also release Amylin, which reduces the impact of glucagon and stops the liver from dropping glucose into the blood.
There are also a number of studies that show that protein and fat together have an increased glycaemic effect in diabetics. As a result, if you are eating LC, HF, MP (medium Protein) it does have a pronounced effect on blood glucose.
Typically LCHF has a proportion of 80-85% Fat, 10-15% protein and 5% Carbs. If you are eating more protein than this then it can be hard to maintain ketosis.
I've tested this reaction to protein using 90% whey isolate that has 1g of carb in a 30g serving. It is 24g of protein, and after drinking the shake, I get a reaction that is similar to eating about 15-20g of carbs. If you read amongst various body building sites and papers, you'll see that one of the functions of the whey protein is to force an insulin reaction. In a non-diabetic this is accompanied by glucagon release to counter the insulin. If you don't have any insulin, the glucagon is still released, your liver still dumps glucose as a result, but there is nothing telling your body to use the glucose and therefore your bg rises.,
I eat a Low Carb diet, but I don't describe it as LCHF as there is too much protein, and I therefore almost never hit ketosis, in spite of having around 30g of carbs a day. If you are excreting protein in your urine as a T1 you are eating too much, and putting too much pressure on your kidneys, which is something you really don't want to do.
A few more links for you on this topic:
http://www.diabetes.co.uk/forum/thr...n-glycaemic-control-in-type-1-diabetes.80911/
http://www.diabetes.co.uk/forum/threads/insulin-load-index-most-ketogenic-foods.75704/