"When trying to argue with someone with an unreasonable view, you can't use logic or reason to change it. It comes from a place in their mind that is irrational, and thus logic will not work." -Some paraphrasing of a quote, the speaker of which I don't remember
I hope his friend has an entire cabinet filled with dietary supplements, otherwise I'd hate to be him when he collapses and his health goes to shit. Unless he's going to the doctor to get massive dosis of everything his body needs, otherwise good luck to him.
...Because a lot of the vitamins and minerals and proteins your body needs cannot be absorbed by just eating veggies, and some of them are not even found in veggies.
You're not going to die, probably, but you're going to get really sick if you suddenly decided you wanted to be vegan (or gradually, whatever), not only because your body is no longer getting some of the stuff it needs, but also because more often than not, the calorie count usually tends to go down if you decide to cut off all the meat products from your diet. Anyone how has tried a low-cal diet will tell you how unpleasant can be the first days after they stopped consuming the calories they were and decreased those a lot (say, going to a 1300 count after being consuming 2500+)... and that's eating meat; now try imagining NOT having it. If you do that, you're going to have a bad time. If you've been doing it for a while, it's more likely your body is vitamin/mineral deficient. So SPEAK to a specialist before you go vegan
They do not just eat veggies if they know what they are doing. Nuts, seeds, fruits, and even oils (the kind you can ingest, not petroleum obviously) all contribute to the diet making it more complete. They would need to talk to a specialist though, in order to make sure they are getting what they need.
You need a lot of different greens and such to compensate if you cut meat out of diet, is the point trying to be made. Meat is not inherently unhealthy, it is needed just as much as greens are, but anything in excess is not good for the body.
I don't think there is anything wrong with being a vegan or vegetarian. I mean, if they're getting all their nutrients then that's all that matters. But they really need to do research before spouting something like this.
What I really don't get is the people who say we should live on a completely herbivorous diet, when our body can eat both, and gets sick when we eat solely one of diets.
You're not going to die, probably, but you're going to get really sick if you suddenly decided you wanted to be vegan (or gradually, whatever), not only because your body is no longer getting some of the stuff it needs, but also because more often than not, the calorie count usually tends to go down if you decide to cut off all the meat products from your diet. Anyone how has tried a low-cal diet will tell you how unpleasant can be the first days after they stopped consuming the calories they were and decreased those a lot (say, going to a 1300 count after being consuming 2500+)... and that's eating meat; now try imagining NOT having it. If you do that, you're going to have a bad time. If you've been doing it for a while, it's more likely your body is vitamin/mineral deficient. So SPEAK to a specialist before you go vegan
Natural selection will take it course...