In recent years, the popularity of probiotics has grown. If you're not taking them, you probably know someone who is. But that's just one piece of the digestive health puzzle.

In his guide, The Essential Book of Fermentation, bestselling author and organic gardening expert Jeff Cox explains why fermentation is key for overall good health. Then he shows you how to bring the world's best fermented foods into your own kitchen with easy tips and recipes.

Our intestines are like an "internal composting system," and the balance of healthy bacteria (probiotics) and yeast in fermented foods makes for a healthy gut and strengthens your immune system, says Cox. Cox talks about his book and shares tasty tips to improve digestion and overall health.

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