Answer: The liver.. :
Your liver is your body's largest solid organ. On average, it weighs around 3 pounds in adulthood and is roughly the size of a football. This organ is vital to the body's metabolic functions and immune system. Without a functioning liver, a person cannot survive.
Explanation: Pretty cool if you ask me.
Invest in a healthy cookbook, you can try new dishes and find some that you like. Research plants that grow well in your climate and plant some fruits/veggies. Buy fresh ingredients. Make a list of healthy foods that you enjoy. Try cooking things different ways because anything can taste good if cooked nicely. (put oil in a pan and cook brussel sprouts until they are a little soft, season with salt and pepper.) Shop at Trader Joe's and Lucky's Market if possible. They have cheap and healthy products. I strongly recommend Lucky Market.