Type 2 Constipation, diabetes and lactulose

Hi all,
I'm here for my partner, for whom I am the carer. He has pernicious anaemia, Hashimoto's disease and recent diagnosis of diabetes 2 (the latter which he has been dodging for years as a prediabetic). He is currently recording (for the first time) his blood glucose before and after meals. We are still trying to bring down the levels through diet and exercise before we next see the GP or endocrinologist. I have noticed that, while he tends to have a relatively high baseline - in the high 6s and 7s, sometimes 8 or 9, his blood glucose does not rise more than a couple of points after meals. He has been walking before breakfast and whenever his sugar levels are high, with moderate results. I have just realised that he is quite constipated and have found out the relationship between constipation and diabetes - where fluid is retained to dilute blood sugar levels and thus taken from the bowel, causing constipation, but also, that slow processing of food can increase the blood sugar levels. I have been giving him actulose (lactulose) daily for two days without results, and have told him to take it three times a day. I gather, however, that lactulose isn't the laxative of choice in diabetes. What do others think and do in this situation?

The problem has persisted over several days and I think has been a feature for months at least. It is only recently, however, that I have learned that it could be associated with the body's attempts to reduce blood sugar levels. Since lactulose causes diversion of fluid back to the gut, I thought it would be a good counter to diabetes trend to retain fluid to dilute blood glucose.

Thanks but Lactulose is indicated for constipation. It takes a while to work and is not addictive. A strangely little known fact is that it is also brilliant for liver failure in that it restores gut bacteria and reins in overgrowths of a gut bacteria that produce ammonia and cause encephalitis, in liver failure. I'm thinking that maybe my question has too many parts. I will repost the part about the baseline blood glucose levels.

My partner can go to bed hours after a meal with a blood sugar of, say 6.2, but wake up with a blood sugar of 9. Most of the time, before meals, his blood sugars are between 6 and 7. Then, after a meal they are not much different. (We eat almost no carbs). So I guess my question arises from the fact that he has highish pre-food glucose that does not seem to be much affected by his meals. Or exercise. Which is one of the reasons I started looking at the constipation as a variation. Thanks for reading.