Gack! Bacon! Don't listen to Billy. Your desire to try a vegan diet is commendable. You probably didn't last on the diet because you need a balance diet with protein in it, to keep you from feeling like you're starving every couple of hours. So try oatmeal with raisins and 2 tablespoons of peanut butter (or a tablespoon of almond butter) for breakfast, maybe with an additional piece of toast with a vegan margarine imitating spread (like Earth Balance). Take an ounce (1/4 cup) of dry roasted, salted almonds with you in case you get hungry between meals. (You can get them at Whole Foods. The one in my neighborhood has a special on them. They're in the bulk foods area.) For lunch have a 7-layer burrito (minus the sour cream) or make a sandwich with garbanzo bean spread or hummus. You can also get vegetarian mayonnaise at Whole Foods. Just read the labels to make sure you aren't buying things with milk (casein or whey or milk solids) or gelatin in them. I like to make hummus with 1 can of garbanzo beans (Bush's is best), drained and rinsed; 2 tablespoons fo fresh squeezed lemon juice; 1 teaspoon of onion powder; 1 teaspoon of salt; 2 tablespoons of sesame tahini, and enough water to make it smooth when you whiz it up in a food processor. You can also add 1-2 tablespoons of full flavored, extra virgin olive oil, if you aren't on a diet. Eat this tasty dish with vegetable sticks.
Also, consider that macaroni and cheese can be vegan also, if you chose the right cheese. Or you can make your own "cheese" using cashews and water, onion and garlic powder, turmeric for the yellow color, some salt and some lemon juice for that cheesy bite. Look up recipes on vegan recipe websites.
Lentils are a healthy vegan food also. They have lots of protein. Cook them with a sprinkle of onion powder and add some diced canned tomatoes for added flavor. Also try tabbouleh (tabouli). You can sample the ones at Whole Foods, but it's better if you make your own, and use fresh squeezed lemon juice instead of vinegar. Use the tabouli wheat, not the salad mix with the spices in it. Use fresh parsley, fresh vine ripe or roma tomatoes, fresh green onions, fresh lemon juice, and coarse kosher salt. Follow the instructions for preparing the bulgar wheat on the package (I use the Steakhouse brand because you can prepare it with cold water.)
You may have to eat every 4 hours instead of every 6-8 like meat eaters do, because vegetables digest in 2-4 hours whereas meat take 4-6 hours to get processed by the stomach. Nuts will help for added protein. Only eat 1 ounce at a sitting.
Also remember to drink lots of water, and avoid the soft drinks. Soda pop and sugary cereals may be vegan, but that doesn't mean they're healthy for you. Eat lots of fresh steamed and raw vegetables, fresh whole fruits, whole grains (not instant anything), and nuts. The fun part is that you get to learn to cook for yourself in that week. That means you can snack on the stuff you are cooking. (cook's privilege)