"Planned vegetarianism is healthy and, shockingly, fun!"
How I did it: I have no religious or cultural reasons for becoming a vegetarian, nor any ethical ones. I mean, I admit that animals meant for slaughter are treated poorly, but I have never cared enough about that to make major changes in my life because of it. That may sound cold, but it's just the truth.
No, I decided to become a vegetarian because I got tired of the taste of meat. For some reason, it became slowly less palatable to me, and eventually became unbearably disgusting. When I reached the point where I could only eat chicken without feeling sick, I decided to take the plunge entirely.
I began to prepare meals in advance, and being forced to do so has actually forced me to make more of an effort in preparing meals. A great consequence of this is the fact that I now have a large selection of interesting, exotic, healthy, and delicious recipes to choose from. My diet has MORE variety now than it did when I ate meat!
Lessons & tips: Contrary to popular belief, simply switching to a vegetarian diet is not healthy in and of itself. Cutting out meat and meat-based products means that your protein intake will drop, as well as your daily vitamin B12, zinc and iron levels.
In men, iron levels are highly unlikely to drop to a low enough level that it can be unhealthy, but women already require more iron than men due to menstruation. Regardless of gender, however, you want to plan your meals so that you get a good mix of fat, carbs and protein, and you definitely want to take a daily vitamin supplement. If you plan your diet, you will live longer, eat better, and become fitter, healthier and happier.
Some people say that being a vegetarian is less healthy simply because there's more emphasis on taking "unnatural" supplements. Well, then we might as well say that eating raw meat is healthier than cooked meat because you don't need "unnatural" heat and cooking oil. I'm sorry, but that's bullcrap. Since you can get all the essentials from a veggie diet and supplements, but WITHOUT the nasty saturated fats and cholesterol found in meat, there's no logical premise for any argument against doing so.
If you still feel that taking vitamins supplements is bad because they're not "natural", then you'd better lay off the antibiotics (and anything else you'd find in a pharmacy), and enjoy your "all natural" cholesterol, high blood pressure, liver disease, cancer, diabetes, and shortened lifespan.
Resources: Clearly labeled vegetarian products, vegetarian recipe books and websites, and Indian food. Seriously, Indian food is some of the most delicious and varied vegetarian cuisine on the planet!