I live alone and am happy to do so, so don't worry about my MH or loneliness! However, as others have touched on, when you live alone preparing three meals a day can be a chore. I am older now and retired and when I was working and moving a bit more I could eat things that I wouldn't touch now.
Anyway, I have to say that for me, I.F. is the best discipline ever, and it has retrained my mind to realise that grazing after 7pm is not necessary at all anymore. It is amazing how much you get used to it. I eat to live now not the other way around. Illness made me lose appetite and enthusiasm for life, but I'm back and ok again with a new attitude since just before Covid and it works so well for me.
I pack in a very nutritious home made smoothie to break the fast. Then full fat Greek yogurt with fruit and nuts when I feel like it. Then believe it or not, porridge or weetabix with flax, chia, and protein powder as a lunch substitute. No one ever said you MUST eat that for breakfast! I'm not good with big meals prepared just for me, so I make do with home made soda bread and cheese, or maybe tinned salmon and salad for tea or something like that. I have Ice cream for a treat at weekends and I don't drink alcohol.
I just walk, nothing else but thankfully at my age I'm limber and have no joint or other mobility issues. I carry a backpack for shopping and it can weigh up to 8 or so kilos if I get shopping while out walking. I only use my car to visit others or the necessary journeys, I walk everywhere else. It's become a habit now. I'll never be slim, but don't want or need to be like a model. I am 5.5 and weigh 66kilos which is ok for me. All bloods done every six months, all fine re lipids, glucose etc. That's good enough for me.
I agree that processed foods (which I don't like!) and sugar/too much alcohol are the devil.