There are a lot of 1 star reviews that note bias but I think those reviews are from people who do not want to face the truth because they do not want to take responsibility for their contribution this problem we have created. We absolutely are over farming animals and harming the environment. There are other documentaries that show that.
I am a meat eater but I have went vegan once and I could absolutely feel a difference. I definitely had more energy.
There is a woman name Annette Larkins who is 81 and looks like she's in her 30 or 40's. She only eaten raw fruits and vegetables that she grew and rain water that she captured for 50 0r 60 years. There is no doubt vegan makes you younger.
If you want an interesting read about food consumption read the Gospel of Peace.