Aside from what it teaches you, there is simply the indescribable degree of peace that can be achieved on a sailing vessel at sea. I guess a combination of hard work and the seemingly infinite expanse of the sea - the profound solitude - that does it for me.
I do the cooking at home. Where we eat no more than 100 grams of meat a day and have 'tons' of fresh vegetables. I prepare the vegetables with a wide range of herbs, spices and such. We also keep on hand lots of fruit, yogurt and great breads.