The most significant switch was considering plant-based food as a main dish instead of animal-based foods. This switch means that instead of eating meat, chicken, fish, or cheese as a main dish, we switched to eating various beans and tofu as the main dish.
We don’t do this for ideological reasons. We still eat a lot of animal-based food- we just cut down a lot. I still drink milk with my coffee, and my kids still eat yogurt. We still eat meat occasionally. However, we eat much less cheese, fish, chicken, and meat.
Please think of the cost for a minute: Let’s say that chicken is $2.99 a pound. (prices vary wildly on location, obviously). Beans are for a pound. Look at the cost savings in that! Add in the fact that beans are considered much healthier for you than chicken, and you have a winner!