Why are vegans idiots? Their existence, and success at being healthier than non-vegans, proves meat is not required. We are capable of eating meat, but it is terribly unhealthy to eat a lot of it. Similarly, we are capable of eating refined sugar, but similarly, it’s terribly unhealthy to eat a lot of it.

...which ones

In general, the composition of plants is a lot more diverse than that of meat. Further off from what you need, individually, but you have all the spikes you need to balance it out, if you do the math. 

The "best" diet is one thats varied/balanced, I think.

If you're not measuring it, this is probably true.

...which ones

In general, the composition of plants is a lot more diverse than that of meat. Further off from what you need, individually, but you have all the spikes you need to balance it out, if you do the math. 

The "best" diet is one thats varied/balanced, I think.

If you're not measuring it, this is probably true.

... What concerns the bolded, here - that isn't how evolution works. There, in fact, exists no such thing as "devolution". We stay with whatever form is most optimal. Saying that eating less meat makes it more optimal to have smaller brains really doesn't have any sort of basis. (In the past, it could - since hunting required intelligence. The same can't be said about choosing ground pork on the supermarket aisle.) That is also not how regressive genes work. They don't activate on a diet, they activate if there is no dominant gene, (ususally only happens when inbreeding).

Again, omnivorous doesn't mean that we need a diverse diet. The whole point of being omnivorous, and what has allowed us to prosper so long, all over the globe, is that just about anything will do. As said, most ancient cultures had 90% of the population living almost exclusively off of the most available starch source. That definitely isn't healthy, and there are a number of specific *deficiencies* that were caused from it (scurvy, the most notable), but it still worked out, otherwise - because the human body is extremely adaptable, as said. These people were physical labourers, by the way - if anything, more so than anyone doing the same today. Deficiencies have been studied for a long, long time. You definitely don't slowly starve yourself to death from a vegan diet.

I'll agree that Veganism is more of a hassle than many people are willing to engage in, and does require you to do some linear algebra on your nutritional intake. Vegetarianism, on the other hand, does not have such a restriction, and is generally considered perfectly healthy, without supplements. 

I've actually already debated someone on here that there aren't any inherent medical advantages to veganism, either, haha, so it's fun to defend the other side, for now. The point remains that there ISN'T anything, at all, in meat, that you can't find in higher concentration in some fairly common plant-based food - be it amino-acids, fatty acids, sugars, or any micronutrient of your choice. It requires some linear algebra to get the proportions right, because each *single* plant is further off from what you'd need, but there is absolutely no scientific reason for which a planned diet should in any shape or form have worse results on your health than taking it from meat. Because, again, in the sum, a diet can be planned to have entirely identical nutritional content, after digestion, if the calculations were done correctly.

Anyways, interesting topic. I'm not vegan/vegetarian, btw, haha!

7 Supplements You Need on a Vegan Diet

1. Vitamin B12

2. Vitamin D

3. Long-Chain Omega-3s

4. Iodine

5. Iron

6. Calcium

7. Zinc

...notice that the bolded part your are referring to specifically distinguishes between vegetarian and vegan.

Ignore the bolding.  I copy pasted everything from the same site.  I don't know why the header unbolded, and then Iron came out much larger than the rest.

Because that's greedy! Leave some for the rest of us!

Aren't you a reasonable and sharing person? =]