Statins on prediabetic patients

All I can say is what I have seen from my experience. 71 yo male, fit, active, decent diet, normal weight. I have never had an abnormal blood sugar reading from bloodwork and there is no family history of diabetes. But since I have been on Crestor for ~6 years my A1C has risen into the pre-diabetes region... like 5.8 IIRC? So for me, at least, it does seem to have some effect on blood sugar, but I am not sure why we have never seen an actual test reading out of range, either fasting or not fasting.

We have been at the Cardiologist yesterday after arriving in Florida vor the winter, and he wants to get rid of the statin because of pre diabetic condition.
Trying to get on Repatha again after Medicare reclined it last year.
We changed our drug plan because of the high expense of Repatha.
First we are going for a lab next week and then our cardiologist makes the decision.

The literature is suggestive of a risk for those who are pre-diabetic and who have metabolic syndrome if they take statins. So, with that factor assumed to be of genuine concern, the issue is increased serum glucose. One way to keep serum glucose tightly inside of a narrow range is to reduce carbohydrate intake. Most adults in the western world have bread, baking, fruit, potatoes and other root 'vegetables' daily, often amounting to 40-60% of our daily caloric totals. That's too much!! Where many of us are essentially not very active/desk workers, and consume as many as 300 gm of carbohydrate each day (many of us almost twice that!), we quickly put on weight due to deposition of lipids, converted sugars, in our adipocytes. Eventually, we find that our adipocytes simply rebel against being forced to accept ever increasing amounts of lipid for storage. Metabolic syndrome. Beyond that, full-blown diabetes Type II.

A great many of us, especially older, especially somewhat inactive, should not be consuming more than about 40 gm of carbohydrate at any one of our three meals (if....IF...one MUST consume three squares each day...that's another topic). This means a total of about 100-120 gm each day. And no snacking...snacking, especially within two hours of bedtime, is literally lethal long-term. But, the point is that by consuming small quantities of carbohydrates, you can keep blood sugar spikes in check, and thence the spikes in insulin secretion.

I would encourage you to look at about 6-12 videos, different channels and hosts/experts, about keto diet and lo-carb diet. I think keto might help you, but you must decide that for yourself, and certainly low--carb is doable for 'most anyone. Just takes self-control and motivation to alter one's current path toward ill health.

Lastly, you should always run things like substantial alterations in activity of a type, and diet, past your care givers to enlist their support and maybe learn that they don't recommend it for one or more reasons...not the way you're describing it to them.