He is still a puppy and they are destructive I’m afraid
I have a 2 year old and a new puppy who is 3 months
Apart from the kitchen, where there is very little they can damage, they are not left in a room alone for literally more than 2 minutes, otherwise they cause havoc! Not so much the 2 year old as he has quietened down a lot, but they refuse to be separated, which is actually quite lovely. I have always crate trained my dogs at night and when we go out, until they are around a year old, which has worked very well. Although he might object at first, dogs do adapt very quickly, could you consider a crate for when he’s alone? He will learn what he can and can’t do if he isn’t left alone where he can cause damage.
Regarding the food, this again can be trained out of him, but firstly you would need to train him to drop on command. I can eat my dinner on my knee with both dogs sat next to me and they won’t come near my plate .... the little one, not so much, it’s a work in progress
However the biggest thing that helps me and this might sound odd, is rewarding good behaviour and ignore bad. Obviously you can’t ignore them if they are doing damage, however it will work with the demanding of attention. My 2 year old loves a chasing and barking game with me and he got quite demanding about it (if my colleagues could see me they wouldn’t believe it). When he came to me and started barking, which was his way of starting the game, I crossed my arms and completely ignored him, however a while later, I got down onto the floor to play, he learnt within a couple of days that the playing was by MY invitation not his. I have elderly parents and from being little puppies, my parents totally ignored them and turned away if they started jumping up, but when they sat down, then they got the attention. They soon learn that jumping up gets them absolutely nothing.
You could consider getting a trainer/Dog behaviourist to visit. As I hadn’t had a puppy for over 10 years, I had someone come for around 2 hours for £75 it was worth every penny, his philosophy being that he trains the owners not the Dog.
It really is very doable with not a lot of work but the difference is I love dogs but I fully respect that it is different for you