GUT HEALTH
and
DIGESTION
Understanding Gut Health and Digestive Physiology
Gut health and digestion involve the coordinated function of the gastrointestinal tract, digestive enzymes, gut microbiota, and neural-hormonal signaling systems. These processes allow the body to break down food, absorb nutrients, and maintain overall metabolic and immune balance.
Digestion is regulated through complex interactions between the enteric nervous system, the gut-brain axis, and hormones such as gastrin, cholecystokinin (CCK), and motilin. These systems control gut motility, secretion of digestive juices, and communication between the gut and central nervous system.
Many common symptoms — such as bloating, gas, diarrhoea, changes in bowel habits, urgency after eating, or digestive changes during stress — are directly linked to these physiological processes. For example, bloating can result from gas production and gut distension, while stress-related bowel changes are mediated through the gut-brain axis.
In this section, you can explore detailed explanations of these processes, including:
INDIGESTION and HEARTBURN
Indigestion and heartburn are common digestive symptoms that often result from disturbances in normal gastrointestinal physiology, particularly involving gastric acid secretion and lower esophageal sphincter function. This section explores the underlying mechanisms of acid reflux, nocturnal heartburn, and related conditions, helping you understand why these symptoms occur and how they can be effectively managed.
Why Do I Get Heartburn After Eating? The Physiology of Acid Reflux and Indigestion
Understand heartburn and acid reflux, including how the lower esophageal sphincter works, common triggers, and why acid reflux causes symptoms after eating, at night, or when lying down. Learn prevention and treatment strategies.
Why Do I Sometimes Wake Up at Night with Heartburn? The Physiology Behind Nocturnal Heartburn
Understand why heartburn worsens at night, including the role of lower esophageal sphincter function, delayed gastric emptying, and body position. Learn the physiological causes, risk factors, and effective strategies to prevent nighttime acid reflux.
GAS and BLOATING
These articles explore abdominal bloating and gas production, including the roles of gut fermentation, dietary components such as FODMAPs, intestinal motility, and visceral sensitivity. They explain how gas accumulation and gut distension contribute to post-meal discomfort.
GUT-BRAIN AXIS
These articles explore the gut-brain axis, a bidirectional communication system linking the gastrointestinal tract and central nervous system. They explain how stress, anxiety, and hormonal signaling influence gut motility, secretion, and sensations such as urgency or changes in bowel habits.
Why Do I Feel Like Going to the Toilet When I'm Anxious?
Why does anxiety make you feel like you need to poop? Learn the medical physiology behind stress, the gut-brain axis, and why anxiety affects bowel movements.
Why Do I Feel Sleepy After Eating? How Digestion Affects Blood Flow and Hormones
Why do you feel sleepy after eating? Learn the medical physiology behind post-meal fatigue, including digestion, blood flow, hormones, the gut-brain axis, and circadian rhythms.
BOWEL MOVEMENTS and MOTILITY
These articles focus on bowel movement regulation, including intestinal motility and reflexes such as the gastrocolic reflex. They explain how digestive signals coordinate colon activity and why eating can trigger the urge to pass stool.
DIARRHOEA
These articles examine the physiological causes of diarrhea, including altered fluid absorption, increased intestinal motility, and impaired digestion. They explore how factors such as dietary fat, bile acids, and gut microbiota contribute to loose stools and digestive discomfort.
