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A doctor says looking after your gut will take care of your brain and immune system, too. Here are 3 things he does himself, including 'gut gardening.'

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75% Informative

Dr. Monty Lyman says the brain, immune system, and gut appear to be interconnected.

He says taking care of our gut health is key to both physical and mental health.

Lyman: "We're part of a loop of mind, body, and microbe" The US digestive-health market is forecast to grow by $7.2 billion by 2028 .