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I'm fructose intolerant too, and when I discovered it, and I adjusted my diet accordingly, my life changed for the better.

Probably your wife knows about it but just in case, I've found a great relief in the low fodmap diet by Monash University.

One of the most under-diagnosed conditions, very hard to figure out by yourself as fructose is everywhere. Staying down below maybe 5g/day for a few days to see the difference requires research. Doing a challenge at the doctor takes a day time and doctors have little awareness to push patients in that direction. Likely as they have little experience due to the treatment being purely nutritional awareness and discipline.

I can not digest fructose, but what helps me is having glucose with every meal eating out, Being intolerant to fructose can also lead to depression if undiagnosed.