I would ask more about his feelings in the toes. If he feels like he is wearing socks when he is not or a sand feeling on the toes where they touch each other, tingling, stabbing, zaps or this condition is still there or has gotten worse it could be peripheral neuropathy but that is not only related to diabetes. It is a condition that now is found to relate to back injury, exposure to aluminum (like from a work place), lyme disease, other circulation issues, and many more diseases, even lightning strike has caused it in some people. If it only happens when he drinks and dissapears later then this is the problem. Other then that it sounds like a nerve damage problem that is coming from some other cause and he should be concerned about it. Many think it is from wearing steal toed work boots 8 hours a day or because they pound pavement at work and it could be a warning for something else. If left too long the damage is irreversable and crippling to some people. It was my only warning that I was diabetic and I let it go not knowing this. Forget the brocures that tell you to watch for blurry vision, frequent trips to the bathroom and a sudden need for water,,, I have been a diagnosed diabetic for three years now after finally going into my doctor for sore feet and still none of those other things have affected me but I have trouble walking still and some days I feel like I would like to cut my feet off and use someone elses feet just for a day even.
Anyway keep tabs on it if you can. There are books on it as well in the library if you want to know more.
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