I've significantly cut down on carbs and sugar over the last four months. I've lost weight, but the real benefit was the reduced inflammation in my joints. I don't know what it is, but I speculate that as we get older, some of us seniors are getting more sensitive to wheat gluten and sugar, and our bodies react the same way as with allergies.
My personal feeling is that we overdose on gluten and sugar our entire lives, and in our senior years our immune systems can no longer cope with the onslaught, and it manifests itself in a variety of so-called "old age ailments".
The most interesting aspect of reducing sugar and carb intake is that you regain your taste sensitivity to sugar and salt. I tasted an apple pie crust the other day. My wife thought it tasted delicious -- I on the other hand was overwhelmed by the sweetness and also the amount of salt in the crust. I couldn't eat it.