I have been researching and talking with vegans for about a year and a half and I have mixed feeling about both the philosophy and the diet (the philosophy will be a blanket statement based on the vegans I have personally talked to in person and on the net and from blog posts and websites I have read, but honestly, I find most of the opinions to be universal).
The diet, for the most part, I can agree with. From most of the studies I have seen, the diet is absolutely the most healthy diet you can follow. If you are interested in such a thing it can add great health benefits, but also reverse health ailments and add years (even a decade) onto your lifespan. However, the Mediterranean diet, which includes seafood and some lean chicken in small portions has been shown to have similar benefits. And despite the fear mongering that a lot of vegans like to spout about meat eating (like it causing cancer), a lot of that information is exactly that- fear mongering. The main study that showed that 'meat causes cancer' specifically states that no evidence was found that meat caused cancer and that the additives added only to processed meat caused cancer. So meat like red meat, and especially lean meat like chicken, are shown to be fine as part of a well balanced diet. Obesity and being unhealthy in general are what cause disease.
Now onto the philosophical side. This is the part I really can't stand. Why? Because vegans seem to believe that everyone should jump on the bandwagon and follow this lifestyle because it is the end all be all of moral aptitude. I personally believe that people should have the right to choose which causes are important to them and work on themselves and helping the world and/or community as they see fit. No one can do everything, obviously. For example, if someone volunteers their time once or twice a month packaging care packages (food and necessities) for the homeless and delivering them, that is what they view as the more important moral use of their time and energy. They consider a human life in need of food and necessities more important than that of an animal being slaughtered. I have seen the argument repeatedly by vegans of 'well they are a human, they should be able to do for themselves'. As someone with chronic illness and mental illness and that is here on a suicide board, I can assure you that is not always the case.
Not eating meat is about ending animal suffering. But the vegans I have asked about doing things to reduce human suffering say that is not their platform. Me personally— I have conditions that allow me to rarely leave the house and participate very little in my community. You wouldn't know it by this post, but I have been vegan (in diet, not philosophy) for going on 6 months. I try not to shop and buy things that I believe are made by these 'sweat shops' we have been hearing about. Those cheap websites like wish, temu, and whatever the other big one is, I can't remember the name off the top of my head because I never use it. But I also don't buy the expensive brands known to use sweatshops like Nike and adidas. I also buy all my produce from locally sourced farms that I personally know and have some connection to the community. I am also hold a huge objection to most imprisonment and the death penalty. Point being— when asking vegans about these issues, I am met (again) with 'not my platform' or 'these are just whataboutisms and deflection of the issue we are talking about'. Yet the same can't be said for them accepting that other people have their own moral code and should be able to choose their own moral standing on which issues are important to them.
I have also seen a lot of hypocrisy by vegans. You can see it here. They won't eat meat and will admonish anyone else for doing so, but will gladly jump on their cell phones, which are made using animals products, to tell you not to eat meat. They will tell you they absolutely need a cell phone to survive in today's society. Maybe that's true. Use it for work. Use it to call 911 if you need to. But that doesn't mean you 'need' it to scroll message boards bitching out people for not following your lifestyle. Do you also 'need' a tv or PlayStation? Are you boycotting the film industry for using gelatin to make movies? Do you ever go to the theater to see movies? If you ask these questions, you will get the response 'it is about reducing the death of animals, not eliminating it and not eating animals is the best way to reduce the most deaths' which to me is the best way to say 'it's the easiest way to reduce deaths and keep me comfortable at the same time.'
I actually could go on (and talk about how vegan studies are just speculation and not based in fact and how there are studies that prove that vegan waste is more harmful to the environment) but I'm almost at 1000 word count so I'll stop for now.
*edit— actually I just came back to say— as someone on a suicide board trying to find the easiest, most painless way to kill myself, I will say that this is the absolute one reason I believe anyone should consider veganism, especially being in our situation. If you can not consider for yourself just pulling the plug in the most accessible way because it might hurt, then you should at least consider how an animal might feel.