I often forget to even eat or can't be bothered with food preparation so I'm a bit under-weight and unhealthy.
I eat very little fruit or vegetables as I usually can't stand the taste and/or texture.
I eat meat about every second or third day.
Most of my diet consists of carbohydrates (pasta, potatoes, rice, grain, etc).
If my not eating meat would result in less animals being killed I would quit. However, one person can't have a large enough impact, and whatever meat isn't consumed is thrown out which seems like a real waste of the animals life (to me). I eagerly await the time when we can produce vat-grown meat.
I think a good portion of my energy requirement each day come from the 10+ cups of coffee I drink each day (1/3 a cup of milk and two sugars for each cup).
I don't really care what other people eat (as long as the animal isn't endangered or overly intelligent) and I certainly don't hate those that have a different diet from mine.
I really dislike the argument that being a vegan/vegetarian is denying our own biology. We deny our biology in regards to many things. Most men deny their biology by not going around humping everything in sight.
Lastly, my youngest brother seriously annoys me with his anti vegan/vegetarian stance as it is all based on his belief that every single vegan/vegetarian guy he has ever been in a relationship with is 'small and scrawny'.
Yeah it is true that the argument against vegan/vegetarians with regards to it going against our biology is really false. It is not at all unhealthy, and yeah, I am not really sure what it even means for something to go against our biology because it is unnatural? By that assumption modern society in general is pretty 'unnatural.' (I am not even sure what that really means?)
Also, I really understand feeling like the amount of meat you personally eat would not make any difference, and that this meat would just be wasted. However, I think you actually do make a difference even if it seems really small. The process towards a society that does not eat any meat will take a long time as a whole, but the whole is comprised of individuals personally making the choice of what to eat. In fact the only way to cause major changes is by the effects made by individual's choices, because the whole is a aggregation of individuals.
While it seems like perhaps the amount you do not eat of meat would simply go to waste, I would consider the degree to which companies in industry are concerned with profit. They certainly do not want to waste their money, so they make careful calculations to budget how much they produce. It is a basic kind of logic, perhaps - and maybe it seems they could not be as precise as the difference of one individual, but... when you consider they you are one of thousands, and that every single human within those thousands is but one human, you begin to recognize the power of your self.
I just searched and found this pretty quickly, not sure how accurate it is but I'll just go by it for example:
http://www.greenlivingtips.com/articles/meat-consumption-statistics.html
So for Australians, this totals to like 109 kg per year of meat consumption. I don't know how much it costs for meat there, and this price probably fluctuates but for argument I will just assume it costs something like $10/kg. If you eat an average amount of meat at a moderate price, I'll just round to $1000 per year as how much you might be spending on meat. That seems like a somewhat low estimate even. Imagine now if you went 5 years without eating meat? You would withhold $5000 from a meat producer. I know in the context of large businesses that is not a lot, but at least it is a substantial amount that may not be completely ignored. Think of going 50 years without meat, or the rest of your life. You might avoid giving $50,000 to meat producers. Does that not seem like a substantial amount of money, perhaps enough to influence their ability to continue production at the same scale they would have if you had eaten meat?
Just think now about how many humans in the world now are vegetarians and vegans... as a whole they are making a pretty big difference, even if it is not a complete change, or anywhere near that even. With time and more individuals making personal changes a complete change is made possible.
You could think of it this way: to buy or not buy is like casting a vote, only economically. If there was a vote for some kind of law, or just a survey even to determine what percentage of people would prefer that animals stop being killed, would you want to check yes on it? If you would check yes, that is basically equivalent to buying other food that meat. Deciding to not eat meat is like voting with your money against animals being killed - except it's more potent than political voting, because your group will have some effect even if they are not the majority.