I use Stevia in my coffee. You can bake with Stevia. I’ve been using it for the past four years or so. My takedown was 2016. I do eat desserts but they are usually small fruit tarts or a small slice of carrot cake and, yes, the sugar will mess with me for a day or so. I avoid desserts that have massive sugar and carb content such as custard donuts, cupcakes, cakes. These will cause messy results and gas. Your husband could try small amounts, maybe a few bites of something to see. Buy the smallest size of something so if it doesn’t work out you aren’t left with wasted food. It takes time so good luck to him, and you.