I'm a vegan which means I eat no animal products.   I'm not supposed to wear animal products either but I still have some leather boots, and a down comforter and a down parka.    The comforter is probably next in line for replacement.  I have to admit I still like the parka. 

I started on the vegetarian direction for environmental reasons, which I learned from reading "The Consumer's Guide to Effective Environmental Choices" by the Union of Concerned Scientists.   Interestingly enough, I had read Fast Food Nation by Eric Schlosser a few years before that but that didn't make me a vegetarian, despite the descriptions of meat production.  It just made me purchase organic beef from a local farm.  Compassion for animals wasn't part of that decision.  I had turned that off long ago.  Back to environmental reasons, I learned that meat production is bad for the environment, using tremendous amounts of water and land resources, and causing a lot of pollution.  In addition, your contributions to global warming from meat eating are equivalent to driving a Hummer SUV 15,000 miles a year.  Interesting that Al Gore doesn't mention this in "Inconvenient Truth".

About this time, May 2005, one of my good friends turned vegetarian and I met a real live vegan.  I was influenced by both, and decided to become a vegetarian.  At the same time, I traveled in Mexico and Sicily, and was avoiding dairy products because it was hot.  About 3 weeks into it, I noticed that my daily indigestion had disappeared.   Wo, was I lactose intolerant?   So I experimented, and sure enough, milk caused indigestion.  I had been thinking that I had acid reflux disease!  I wonder how many people taking indigestion medicine are just lactose intolerant.  That made it easy to transition into veganism along with some hints I was getting that dairy and egg production are the most cruel (with pigs close behind).

Once I became a vegan, I read several books and learned a lot about nutrition and health.  I was surprised to learn about the tremendous benefits to your health from a vegan diet.  Eating a reasonably healthy vegan diet substantially reduces risk for most chronic diseases such as heart disease, diabetes, even rheumatoid arthritis.   And eating a low-fat vegan diet reduces your chance of getting cancer.  I noticed a great improvement in how I felt after becoming vegan.  I became more energetic.  I've never noticed anything close to this effect from anything else I've ever done for my health (which was just exercise up to that point).  I also lost some weight which contributed to making me feel better. 

Finally, I began to learn more about factory farms and animal treatment, not to mention the less-than healthy aspects of our current system of meat production (hormones, antibiotics, slaughter of sick animals, yuck).  The links below describe it better than I would. 

I recently heard what I thought was a good argument for becoming vegan.  People eat meat because it's enjoyable and it tastes good.  It's not necessary for your health; in fact, all the evidence points to it being harmful.  It's understandable why our recent ancestors in northern latitudes ate meat and dairy, but now with transportation of fresh fruits and vegetables to any location, it's not necessary.  Even if animals weren't tortured as they most definitely are, you are still raising and killing animals for the sole purpose of enjoying eating them and their mammary secretions.  To summarize, we kill animals for the pleasure of eating them, which is not a good enough reason for me.  Here is where people come back with, "Our ancestors did it."  Well, they did lots of other weird stuff I wouldn't want to do either.   Plus, according to this article, our early ancestors ate mostly nuts and fruit, and were more often prey rather than hunters.  This article by Dan Piraro describes the physical characteristics of carnivores and herbivores, and you probably can guess the punchline since I'm linking to it.  :)

Here are some websites, books, and podcasts with more information:

Animal treatment:
Dan Piraro, author of Bizarro comics, describes it pretty succinctly here.
Animal Rights:  The Abolitionist Approach, website by Gary Francione.  I haven't read his books, just heard him interviewed/debated on several podcasts.  It's the most thought-provoking stuff I've come across and has opened my mind.  He's going to have a podcast soon.
Meet your meat, a video about meat production.
This is good too if you like cartoons:   the meatrix
This is a really cute and funny video called "Cows with Guns." 
yuck:  factoryfarming.org
Meat Market:  Animals, Ethics and Money, by Eric Marcus.  This provides convincing arguments for veganism.  
Vegan:  The New Ethics of Eating, also by Eric Marcus, and you can get it for free here.

Environment:
An article from AlterNet describing the environmental benefits of vegetarianism.
"The Consumer's Guide to Effective Environmental Choices" a book by the Union of Concerned Scientists.

Health.   The followings links are all to M.D.s or dieticians (in the first case) who both actively research the scientific literature and have published studies in the standard medical journals.
Becoming Vegan:  The Complete Guide for Adopting a Healthy Plant-Based Diet, by Brenda Davis and Vesanto Melina.  This an invaluable nutrition guide that all vegans should read, so you learn how to get your omega-3s (ground flax seed) and B-12 (supplements), and much much more!
DrFurhman.com, M.D.  His approach is to eat foods with the maximum nutritional benefit, so a large component of his recommended diet is leafy green vegetables.  He recommends eating plenty of fats from healthy sources like avocados and nuts and seeds, but not from oils.   Fats also help in nutrient absorption, so, for example, it's good to include avocado and sunflower seeds in a salad (yum). 
McDougall Wellness Center, another very informative website about the health benefits of a low-fat vegan diet.  McDougall summarizes and responds to medical literature in his newsletters. 
Prevent and Reverse Heart Disease with a low-fat vegan diet, by Caldwell B. Esselstyn, Jr., M.D.  This surprised me.
The China Study, a book by Colin Campbell and Thomas Campbell II about the cancer causing effects of animal protein.  The main author grew up on a dairy farm and thought he would spend his career discovering the benefits of animal protein rather than the drawbacks.
There are similar books/research by Dean Ornish and Neal Barnard, also promoting low-fat whole foods plant-based diets.
Physicians Committee for Responsible Medicine (PCRM), a website with many articles about the health benefits of veganism.  This is a nonprofit organization and they have a good online bookstore with a good assortment of cookbooks and health books by PCRM authors and outsiders.  Their mission is to promote a healthy lifestyle, not only their own products.  An example short article from the PCRM describes the health concerns about dairy products

Athletics:
This is a great website for athletes.   http://www.organicathlete.org/.  

General information:
vegsource.com, lots of info.
Vegan Freak:  Being Vegan in a Non-Vegan World, by Bob and Jenna Torres, a great book for beginning vegans.  They also have web forums and an entertaining podcast.

Podcasts (I subscribe from iTunes rather than the links below):
compassionatecooks.com, by Colleen Patrick-Goudreau. The podcasts are typically <30 minutes long and have very compelling arguments to go vegan.  Plus she answers those frequently asked questions like "where do you get your protein?  where do you get your calcium?"  These are very well-written and well-spoken, therefore enjoyable to listen to.  This is great if you want a primer on veganism in short segments.  If you become a subscriber, you get a free recipe every so often.  I highly recommend the "gorgeous greens soup." 
Vegan freak radio, by Bob and Jenna Torres.  These podcasts are often more than an hour long and are entertaining.  These are meant to provide a community for vegans where you don't feel like a freak for the hour that you are listening.  They have good interviews, and feedback from readers via voicemail and email. 
Vegan radio, a radio show broadcasted from Northhampton, MA.  It's fun and they have good interviews too.
Animal voices, a radio show from Toronto, that's more serious, but has good interviews.
Eriks Diner.  Erik Marcus' podcast:  latest news and suggestions for activism.

Cooking:
Here are some of my favorite cookbooks at the moment:
fatfreevegan.com  okay, this isn't a cookbook, it's a website and is my main source of recipes.  It sounds horrible, vegan AND fatfree?   Actually, it's not fat-free, just mostly oil-free.  I love beans (legumes) and most cookbooks are deficient in this category but this website is not.
The Peaceful Palate, by Jennifer Raymond, easy, healthy recipes.  This is a great starter-book for the beginning vegan.  This is my second most used source for recipes, especially in winter because it has good soup recipes.
Vive Le Vegan, by Dreena Burton,  easy, healthy, and interesting recipes
Vegan with a Vengeance, by Isa Chandra Moskowitz, really creative and interesting recipes (chickpea and seaweed sandwich spread?!  delicious!)
The Voluptuous Vegan, by Myra Kornfeld and George Minot, really good recipes, good for weekend meals when you have more time to prepare, though some of the soups are easy.

There are many, many more good cookbooks for all kinds of cooking (quick, slow, gourmet, junk).  Just do a search on amazon.com. 
I love food porn (though I haven't visited much lately):
FatFree Vegan Kitchen,  Susan Voison's blog, she also maintains the fatfreevegan site mentioned above.  She is from Louisiana and has the best gumbo and jambalaya recipes I've come across.   Plus lots of other recipes that use the many fresh veggies we get in the summer from our CSA.
http://www.postpunkkitchen.com/forum/viewforum.php?id=29
http://vivelevegan.blogspot.com/
http://eatair.blogspot.com/
http://veganmenu.blogspot.com/

Online recipe lists:

vegweb.com
post-punk kitchen

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