Our ancestors ate animals.
We evolved to eat animals.
Sure some of our ancestors ate meat.
Maybe we did evolve to eat meat. But we don't need to eat it. The NHS, the British Dietetic Association, the America Dietetics Association and the Academy of Nutrition and Dietetics all say you can be a healthy Vegan at every stage of life. Here is a free PDF to download that includes the information from all these world health bodies - https://tinyurl.com/y5fzl3vk .
Your probably reading this on an electronic device that uses electricity, living in a house with running water. All of which our ancestors did not use. So we can't pick and choose what our ancestors did to justify our actions now.
Eating and using animals for food and products is a system of cruelty, We don't have to do this. Live a Vegan lifestyle.