a healthy diet can and often does include meat. and yogurt especially since it has probiotics in it. theres usually more of an issue with high carb intake than anything else. that being said its all dependent on the individual person and what their gut flora specifically needs and its pretty irresponsible to try and tell hundreds of people you dont know to follow a specific really restrictive diet. if anyone wants actual dietary advice your "best protection" is to do your own research, try things, trust your body, and if you can afford it more than anything else consult a nutritionist about your specific needs