Microplastics found in the human gut have been linked to the development of depression. Early research is among the first to examine how different types of microplastics commonly found in the environment interact with the human gut microbiome. The gut microbiome, or the complete collection of microorganisms in the human gut, is increasingly being referred to by scientists as the “second brain” as we learn more about its vast impact on our health and mood. It contains trillions of micro-