It can be very difficult to get back onto the VLCDs after a break. But what we are trained to advise is that if you have to eat, eat lean protein and green leafy veg. Stay off alcohol as it will make you want to eat more, and you shouldn't drink alcohol whilst in ketosis anyway. Eating protein and green veg will not knock someone out of ketosis and won't therefore make them hungry afterwards. If you eat any carbs, bread, pasta, rice, potatoes, noodles, or carby veg like carrots, tomatoes, onions, peas and beans these will knock you out of ketosis and the first thing that comes back is the hunger.
Now everyone is different. I have managed in the past to do a month of SS and then have a break for a birthday takeaway and then the next day just start again and it was absolutely fine, and I wasn't staying off carbs. But I do know that many people just have a tough time restarting. So really the only person who knows if you can pull off a break in the diet is you.
Good luck.