Posted this in Calling All Vegetarians & Vegans and though I'd store it here as well :)
I was about six or seven when I first started objecting to my food coming from animals. I think it was the founder of the Body Shop and Linda McCartney who first made me aware!
I didn't learn very much, I just refused to eat red meat; something about eating mammals jarred with my kiddie instincts. (Still does!) But my parents wouldn't let me give up fish - both being meat-eaters themselves they were convinced I wouldn't get enough protein etc. without it - and because tinned tuna is so anonymous I didn't fight them on it.
I didn't really think about it again until my early twenties; only eating fish, eggs and dairy had just become habit. Then I started getting fit after having put on a lot of weight and began learning a bit about nutrition, partly through SP, which led me to some obvious (though revelatory at the time) issues surrounding the production and farming of animals. Suddenly I didn't just have philosophical objections, I was disagreeing politically with mass production and the food industry at large, the associated destruction of people's livelihoods all over the world as well as habitats, the capitalist element, the cultivation of resistant viruses, the whole thing.
I read that in Europe we weren't just depleting the seas, we were basically eating Africa out of self-sufficiency by over-fishing, so I officially gave up fish about three years ago. I was also eating far less dairy and got very into tofu. Unfortunately at the same time I also got a bit obsessive about my food and exercise which ended up causing other problems and ultimately meant I couldn't maintain the lifestyle.
For a variety of reasons I've been very unhealthy for about two years and my convenience dairy intake is far more than I'd like. So basically right now I just eat eggs and dairy, though I'm now trying again to replace the nutrients with vegan options, especially when I'm cooking for myself, as I was a couple of years ago.
I had freshly-caught mussels on holiday in Scotland last year which I rationalised to myself by saying it was the most honest way I could get food that day. (One thing that really bugs me is how divorced most of us are, as cultures and individuals, from the source of our food, whether that's the killings aspect or the labour involved or whatever.) I'm still not sure if I completely agree with that decision! My first thought when I'm unwell also tends to be "I need some fish". I'm about to be tested to see if I'm deficient in anything that could be prompting this.
I recently started using Vega One smoothie supplement as a way to kickstart my nutrition.