The microbiome, consisting of trillions of m icroorganisms , resides in the human gut and play a significant role in keeping us healthy and preventing disease. Everything we consume has the potential to enhance, maintain or undermine the health of our microbiome. The complex relationship between what we eat, our physical activity and our environment determine the the make-up of our gut microbiota. We are only just beginning to appreciate the health consequences of specific microbiome profiles and what influences their make-up. Certain foods help good bacteria flourish while other foods negatively impact the microbiome. Physical activity, environmental irritants and allergens also influence the microbiome. Learn what can be done to keep our microbiome healthy and prevent disease .