Hi Karen! I am no doctor and am only 5 weeks into my sugar free journey and have just started using dextrose in my cooking (like literally days ago). I found this information
http://www.easy-sugarfree.com/dextrose.html From reading some of David's work I was under the impression that if you are continuing a normal diet with fructose and then adding dextrose recipes as well, then that is where problems can arise. But assuming dextrose if a form of glucose and glucose is able to be broken down and used by the body, then it would be fine.
I will be following this post to see if anyone else can shed more light on this question.
Cheers Jess
www.thebigmum.com