I stopped eating meat 12 years ago. We decided, after years of keeping quail, we wanted to start keeping chickens. We read up about all they needed, set up our chicken coop and run and drove to get our ex battery rescue chickens. It was so exciting we couldn't wait. We drove to a big barn on a farm miles away, where the charity had put hundreds of chickens to be chosen from, with our boxes and donation money. We walked into the barn and I looked around at these poor creatures and the state they were in and I said "I am never eating meat again" and I haven't, not a mouthful. I never criticise anyone for eating meat it is entirely their choice but I knew at that moment it was not for me.
I used to eat fish a lot but a few years ago had to go on an iodine free diet in preparation for treatment for thyroid cancer. I wasn't allowed fish, dairy, eggs, any type of prepared processed meal, take aways or even chocolate. I could have two pieces of dark 70% cocoa chocolate a day, it was hardly worth the effort! I moaned and moaned and practically went into withdrawal, but then strangely after two weeks I suddenly realised I had got used to it and on this diet of vegetables, beans, pulses and rice I was feeling incredibly well. I haven't kept it up strictly, and I admire committed vegans who are able to, but I have drastically altered the main staples in my diet since then and feel all the better for it.
As my diet has such a high fresh vegetable content, the best bit of advice I read was to prepare the food in advance. If I have some spare time at the beginning of the week I wash and prepare all the vegetables for several days and I store them in plastic containers in the fridge ready for use. How many times did I used to plan to have butternut squash or the like and then at the end of a busy day at 6 o'clock faced with a pile of vegetables to work through think I can't be bothered I'll have something else, always less healthy. Once they are prepared in the fridge it is no bother at all just to put them on. On these cold days, it's so much nicer to eat something hot for my lunch and nice for them to be already prepared. I usually have omelette and roast veg or often just roast veg with some bread. There's nothing nicer than mopping up the warm olive oil and garlic at the end with a chunk of bread.