[2026] PTE Academic Reading - Multiple Choice, Multiple Answers

The human gut microbiome consists of trillions of microorganisms, including bacteria, viruses, and fungi, that reside primarily in the large intestine.This complex internal ecosystem is increasingly recognized as a vital component of human health, performing functions that the human body cannot execute alone.One of the primary roles of these microbes is the fermentation of non-digestible dietary fibers into short-chain fatty acids, which provide energy for colon cells.Furthermore, the microbiome is essential for the development and regulation of the immune system, helping the body distinguish between harmless microbes and pathogenic invaders.Recent research has also explored the 'gut-brain axis,' a bidirectional communication network that links the enteric nervous system with the central nervous system.Studies suggest that imbalances in gut bacteria, known as dysbiosis, may be linked to neurological conditions such as anxiety, depression, and even Parkinson's disease.The composition of an individual's microbiome is influenced by various factors, including genetics, diet, and the use of medications like antibiotics.Antibiotics, while necessary for treating infections, can inadvertently deplete beneficial bacteria, leading to a temporary loss of microbial diversity.To restore this balance, many health experts recommend the consumption of probiotics—live beneficial bacteria—and prebiotics, which are fibers that nourish existing microbes.As our understanding of this field deepens, personalized nutrition based on an individual's unique microbial profile may become a cornerstone of preventative medicine.