I've been a vegan for 12 years (and a vegetarian since 1876). I don't consider it a "plan," or a "weight loss diet," but a lifestyle. Vegan usually means avoiding all animal products in food, but also in other products (leather, silk, fur, wool, etc.) You can, however, just be a vegan in diet. It definitely seems hard and radical at first, but it becomes second nature after a while, especially if your motivation is strong.
There are actually quite a few processed foods that are vegan, you just have to know what to look for. I'm a whole fooder anyway, so most "processed foods" don't appeal to me for that reason (white flour, white sugar). The other day, I found several types of breads that are vegan in the regular grocery store. However, they either were whole grain, or they contained high fructose corn syrup (which is vegan, but not nutritious), so they didn't interest me.
An excellent book that is full of nutritional information, inspiration and resources is "Becoming Vegan." I forget the authors' names, but you can find it at one of the stores below, or at
www.veganstore. com that someone else mentioned.
Some online sources of vegan products (where you can pick up this book as well) are :
www.veganessentials.com (my favorite: I order online on Sunday, and get my package on Tuesday! They also have vegan Earth shoes)
www.adifferentdaisy.com (very slow shipping: I think one person runs the business, but they carry a line of supplements that Vegan essentials doesn't). Both these stores have very reasonable shipping. VE ships for either $5.95 or $6.95 (there may be a more expensive shipping tier, but I've never hit it, and I've sometimes ordered $300 worth of shoes, supplements and food at once. They carry vegan Ear5th shoes, for less than the price at the Earth Shoe site).
Veganessentials just recently got some more vegan glucosamine products, including a joint support power with flax, glucosamine and other nutrients.