I’m lucky that my husband is very supportive over my food choices - I had to go practically veggie recently due to a meat allergy and he said he would too, in support. He was delighted with the pack of bacon and dedicated frying pan I gave him for Valentine’s Day, though....
But... and there’s always a but. He thinks I can just have a “day off” and treat myself to whatever on special occasions and handle a spike with insulin. Technically I could, I suppose - but I’m finding a big dollop of carbs plus insulin makes me feel really sluggish so for the sake of feeling well, I’d just rather not. It makes me feel almost as unwell as the foods I’ve become allergic to, so I’m trying to equate it to that when I explain. Like it sounds with your wife, I think he feels it’s some kind of rejection of a treat (gift) he’s offering me, and feels slightly offended because I just don’t want it.
He’s also having some problems with the 100g of fat I’m eating a day. From a family who has suffered with heart problems, he’s had the “low fat” mantra rammed down his throat (literally) all his adult life. He’s coming around now, but it’s conditioning we’ve both had to overcome.
Perhaps talk to her about it in the light of you trying to maintain your health long term so you can continue to be a good husband and father to your family, that it requires sacrifices, but that you’re willing to make them so you minimise the chance of complications. Hopefully, with her prediabetes, she might be more inclined to listen to you if she joins you in what you eat, so she can stop it from developing. Best of luck xxx