My grandma taught me that God created every part of every food with a purpose and specific design, and therefore nothing is wasted. With her grandmother, my great-great grandmother, holding onto native Amazonian customs despite living among those considered to be civilized, my family was raised being used to using everything they had on hand. This included roots, leaves, skins, and peels in soups and broths, teas and medicines. The concept of food being trash or "wasted" was foreign. So I grew up with this mentality from my parents as well, and the ever-increasing food waste rate is alarming to me. I think it all begins with gratitude for what you have and consciousness of its meaning.
Whatever you feel like you really can't or wouldn't like to use, you can compost and add to your garden. If you don't compost, mostly every town has a composting facility that will take your leftover roots, leaves, peels, and parts of your food you don't like that you can collect in a Tupperware for the week. When you start to think like this, you learn to spend less money and to value food more.
Some helpful info on how to start :) https://www.gardeningknowhow.com/edible/vegetables/vgen/stem-to-root-gardening.htm