求翻译：Core health begins in the core of your body ?the intestinal tract where 70% of the immune system resides. Diet, stress, travel and even some medications encourage bad bacteria to flourish in your intestinal tract. When bad bacteria outnumber good bacteria, your digestive and overall health is open to a host of potential concerns. Culturelle? with Lactobacillus GG, the most studied probiotic (good bacteria) safely and naturally replaces the bad bacteria in your digestive tract leading to improved core health ?healthier digestion and a balanced immune system.是什么意思？

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