Livestock and their by-products account for 51% of all worldwide greenhouse gas emissions; animal agriculture is responsible for around 90% of Amazon destruction; 70 billion farmed animals are reared annually worldwide and more than 6 million animals are killed for food every hour. And 1,100 activists have been killed in land disputes in Brazil during the past 20 years. [Food and Agriculture Organisation (FAO), the Intergovernmental Panel on Climate Change (IPCC), the Worldwatch Institute and the US Environmental Protection Agency (EPA)]
If someone wants to choose a vegan diet for one of these two reasons, the one that makes the most sense is for personal reasons, such as health. The planet may not be able to sustain everyone being vegan, since it would lead to a need for a lot more farmland. That being said, this question seems to assume that everyone should be vegan. In my opinion, it's not the healthy way to go, because we do need other foods in our diet. The food pyramid is the best thing to follow, with a lot of moderation for meats.
Although it would probably be healthier for the planet if everyone adopted a vegan diet,it would be unreasonable to think everyone would.Many people are so used to their meat based diets that it would be a major challenge for them to change.Also many people find it too challenging to eat a balanced diet when they have to be careful about their protein choices.
No, not everyone should adopt a vegan diet for better health, because it would do more to help the planet than it would be for health. It costs more to produce animal meat to eat than it does to produce vegetables. The extra money that goes into meat production can be used to take food to people who have less and are hungry.
I do not think that any person on this earth would benefit from a vegan diet. I think that meat which is full of protein is the best thing that you can put in your body, and that with good management practices you can have plenty of animals to eat.
I do not believe everyone should feel obligated to adopt a vegan diet much less should they be forced to decide why they are adopting a diet. While it's nice to assume that everyone would benefit from vegan diet, health wise, this isn't really true. Secondly, a vegan diet isn't better for the planet, some people just like to say it's better for the planet.