There will be matter and energy inputs, and matter and energy outputs. Matter and energy are really part of the same thing and are never created or destroyed - they only move from place to place. Photosynthesis is the process where plants create the food to allow them to live. That process has inputs and outputs, too. The inputs of photosynthesis are light energy, and matter in the form of water absorbed through the roots, and carbon dioxide absorbed through the leaves. Photosynthesis also has matter and energy outputs. The main outputs are oxygen, which is released into the air, and glucose sugar (chemical energy), which is used to keep the plant alive. This happens by replacing dead cells and creating new ones to allow the plant to grow larger and continue to live.
One serving of kale contains 121 milligrams of omega-3 fatty acids and 92.4 milligrams of omega-6 fatty acids. Kale is one of the best vegetables for your health. See: The Best and Worst Vegetables to Eat.
As with many other dark leafy greens, kale tastes slightly bitter when eaten raw, but unlike some of its relatives, cooked kale won't lose its general shape or texture, nor will its volume reduce dramatically. For whatever reason, many cuisines pair kale with potatoes, as in this colcannon recipe from Ireland.