Eating isn't just about getting nutrients though. You need to think about the health of your whole body and its relation to diet, which includes thyroid health, hormones, metabolism, liver health, stress etc, regardless of whatever the makeup of your diet is. I'm not advocating a high-meat diet, but I think a good diet should include meat at least once or twice a day. Part of the reason why I think veganism is radical is because it is firstly a diet whose priority isn't health first, and it is typically tied into political movements. I understand the moral issue that vegans have but realize that you are emphasizing this over your own health. I think ethical issues are a factor in every industry (pesticides, contamination etc).
The methods of how you consume foods is important. Whether you boil, steam or eat vegetables raw makes a difference health-wise, in terms of digestibility, nutrient availability, as well as exposure to toxic anti-nutrients. But consider researching the health problems commonly associated with foods that vegans typically consume because there are many with respect to lentils and beans, nuts and seeds, grains, veggies, soy etc. But there's pros and cons to every food group.
I can't say I've thought the food pyramid or was anything but an obvious attempt to get people to support eating foods from each major industry so I've never taken it seriously. I think it's always best to do your own research before trusting any organization who may simply have an agenda to push. There's propaganda on all sides. Regarding meat and carcinogens, I'm guessing it is the methods used to cure meat, or cook meat which can be an issue especially for those who routinely use the BBQ.
You can go vegan if you want, but I recommend you do your own research, and do more than watching a few videos from one side. I'm sure you'll get a temporary benefit in so far as a break from digesting meats and dairy, but you could also get this from occasional fasting and/or not over-eating via huge meals. But if you do go vegan, pay close attention to how your body is reacting otherwise you can ruin your health as so many have.