TA: Identifying Opposition

Someone tries to persuade me to be a vegetarian. I am, for the purpose of finding opposition in this case, married, 22 years old, and I eat lots of meat because I like it. My wife is studying public health, and likes to talk to me about healthy habits. I have a basic knowledge of good nutrition, but I don't know a whole lot. When someone tells me that I should stop eating meat, these are my questions and doubts:
* How will I get protein in my diet?
* How will I get the iron that I normally get from red meats?
* I will need another way to get the healthy fats that I can't get from vegetables and fruits.
* I need lots of calories for my active lifestyle, if I don't eat meat, I would end up buying more food and my grocery bill will be more expensive.

If I were the persuader, I would tackle these doubts by saying the following:
* You can get protein by combining partial proteins like beans and rice, or you can eat cheese or eggs, or other non-meat animal byproducts.
* You get iron from dark green leafy vegetables such as spinach (which can be quite tasty raw, I would mention that in response to an anticipated revolt against spinach), also broccoli provides iron. You can also get it from most cold cereals.
* You can buy bulk grains for much cheaper than you can buy meats. You can also buy fruits and vegetables in season for a better price than foods out of season. Shopping for foods in season is a very inexpensive way to get a lot of veggies. Meat is always several dollars per pound, and carrots, for example, are only usually about 50 cents per pound. 4 pounds of carrots is the same price as a single pound of pork chops.

That's obviously not a complete argument, but I would make sure to focus on those aspects during the portions of my paper that I will spend responding to opposition.