That night he rushed around, bagging up now-unwanted frozen steaks, ready-made chicken tikka masala meals and salmon fillets to give to our friends, I stood back, wondering just what effect this would have on me and our kids, William, six, and Matilda, three.
I assumed I'd find it much easier than Russ because I've never loved meat or fish. While he would choose steak or a burger when eating out, I'd often have vegetable sides instead of a main course. On our second night of veganism, we gleefully discovered that our favourite Italian restaurant had several vegan pasta dishes on the menu.
But excluding dairy was hard and on day three I forgot and bought a cappuccino. That night, when I confessed over tofu and bean sprouts, Russ was calm yet resilient. The next day I realised that I wasn't ready to commit when I ate a cheese platter.
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Meanwhile, Russ stayed the course. He's only fallen off the wagon once, after a night with the boys led to a detour to a burger bar that didn't have any vegan options. He then came home and gorged on 20 (20!) sausages that were hidden in the freezer. The next day he felt dreadful (unsurprisingly).
But overall, however much I like to tease him about it, veganism has made him feel great. His joints are less stiff, he's lost half a stone, has more energy and even seems less grumpy. We don't eat out as much as we used to, which is saving us money. Plus Russ now takes charge in the kitchen, making things like lentil curries and root-vegetable stews.
I still can't quite believe that I'm married to a vegan, and neither can his friends, who wonder if he's going through an existential crisis. I doubt it's for ever: he loves pepperoni far too much to give it up for good. I hope, though, that the healthy-living habits will stick. As long as I can keep him away from yoga pants, we'll be fine.