The wife and I are not fitness models to begin with, so we have implemented a proactive plan to help avoid weight gain during our quarantining.
1 - About 9 am (we both have it on our calendars) she walks into my home office, freshly showered, make up and hair done, sometimes in lingerie, sometimes in nothing but heels and jewelry. We then spend the next hour or so doing a combination of stretching, yoga, and cardio-vascular intensive exercises ;-)
2 - We skip lunch completely. No snacks and no meals except breakfast and dinner.
3 - Some days, we repeat the exercise session again, mid or late afternoon. We do try to change up the routine a bit, to work different muscle groups of course!
4 - No drinking alcohol before dinner, period! At dinner we both like a glass of wine, then usually more wine for her and beers for me afterward.
This works out very well for us with no real difficulty. The only downside we had was totally skipping lunch and not drinking until after dinner, but we moved to having a bit earlier dinner which easily solved that issue.
We are now having dinner at noon.