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Digestion: How Your Body Breaks Down Food😋

 


Digestion: How Your Body Breaks Down Food😋

Digestion is the process of breaking down large, complex food molecules into small, simple ones that can be absorbed by your body and used for energy, growth, and cell repair. Digestion involves several organs and glands working together to move food through your digestive system and break it into smaller parts.


The Mouth

Digestion begins in the mouth, where your teeth and tongue mechanically break down food into smaller pieces. Your salivary glands produce saliva, which moistens food and contains an enzyme called salivary amylase that starts to break down starches, a type of carbohydrate

As you chew, you form a small ball of food called a bolus, which you swallow and send to your oesophagus.


The Oesophagus

The oesophagus is a muscular tube that connects your mouth to your stomach. When you swallow, a ring of muscle called the lower oesophagal sphincter relaxes and lets the bolus enter your stomach. Then it closes to prevent food from going back up

The oesophagus uses rhythmic contractions called peristalsis to push the bolus down to your stomach


The Stomach

The stomach is a sac-like organ storing up to 2 litres of food and liquid. It has three main functions:

  • Mixing food with gastric juice, which contains hydrochloric acid and digestive enzymes that break down proteins and fats
  • Killing harmful bacteria and pathogens that may be present in food
  • Regulating the release of food into the small intestine

The stomach churns and squeezes the food, turning it into a semi-liquid mixture called chyme. The chyme then passes through a valve called the pyloric sphincter into the small intestine


The Small Intestine

The small intestine is a long, coiled tube that is divided into three parts: the duodenum, the jejunum, and the ileum. It is where most of the digestion and absorption of nutrients take place

In the duodenum, the chyme mixes with bile from the liver and gallbladder, which helps emulsify fats and make them easier to digest. The chyme also mixes with pancreatic juice from the pancreas, which contains enzymes that break down carbohydrates, proteins, and fats further

The jejunum and ileum are mainly responsible for absorbing the nutrients from the digested food into the bloodstream. The lining of the small intestine has millions of tiny finger-like projections called villi and microvilli, which increase its surface area and allow more nutrients to be absorbed


The Large Intestine

The large intestine, also known as the colon, is a wider but shorter tube than the small intestine. It has four parts: the cecum, the ascending colon, the transverse colon, and the descending colon. It has three main functions:

  • Absorbing water and electrolytes from the undigested food and forming solid waste called faeces
  • Hosting beneficial bacteria that help digest some fibres and produce vitamins such as vitamin K and biotin
  • Storing faeces until they are eliminated through the rectum and anus

The large intestine also contains a pouch called the appendix, which has no clear function but may play a role in immunity


The Liver, Gallbladder, and Pancreas

These three organs are not part of the digestive tract but they support digestion by producing and secreting substances that help break down food.

The liver is a large organ that performs many vital functions such as detoxifying blood, storing glycogen, producing bile, and synthesizing proteins. Bile is a greenish-yellow fluid that helps digest fats by emulsifying them into smaller droplets

The gallbladder is a small sac that stores bile produced by the liver. When you eat a fatty meal, your gallbladder contracts and releases bile into the duodenum through a duct

The pancreas is a gland that produces pancreatic juice, which contains enzymes that break down carbohydrates, proteins, and fats. It also produces hormones such as insulin and glucagon that regulate blood sugar levels

              How to Improve Your Digestion

Digestion is essential for your health and well-being. Here are some tips to improve your digestion:

  1. Eat a balanced diet that includes a variety of foods from different food groups. Aim to eat more fruits, vegetables, whole grains, lean proteins, healthy fats, and probiotics. Avoid or limit foods that are high in fat, sugar, salt, or processed ingredients.
  2. Drink plenty of water and stay hydrated. Water helps your digestive system function properly and prevents constipation. Aim to drink at least eight glasses of water per day or more if you exercise or live in a hot climate.
  3. Chew your food well and eat slowly. Chewing helps break down food mechanically and stimulates the production of saliva and digestive enzymes. Eating slowly helps you avoid overeating and gives your stomach time to signal your brain that you are full.
  4. Eat smaller and more frequent meals. Eating large meals can overload your stomach and cause indigestion, bloating, or acid reflux. Eating smaller and more frequent meals can help your digestive system process food more efficiently and prevent these symptoms.
  5. Avoid eating late at night or right before bed. Eating late at night can interfere with your sleep quality and cause your stomach to produce more acid. This can lead to heartburn, acid reflux, or GERD (gastroesophageal reflux disease). Try to eat at least three hours before bed and avoid spicy, fatty, or acidic foods at night.
  6. Manage your stress levels. Stress can affect your digestion in many ways. It can alter the balance of your gut bacteria, impair the function of your digestive muscles, increase inflammation, and trigger or worsen digestive disorders such as irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), or ulcers. Find healthy ways to cope with stress such as meditation, yoga, exercise, hobbies, or talking to someone you trust.
  7. Exercise regularly. Exercise can improve your digestion by stimulating blood flow, enhancing bowel movements, reducing stress, and maintaining a healthy weight. Aim to get at least 150 minutes of moderate-intensity physical activity per week or 75 minutes of vigorous-intensity physical activity per week. Choose activities that you enjoy and suit your fitness level such as walking, jogging, cycling, swimming, dancing, or playing sports.
  8. Consult your doctor if you have any digestive problems or concerns. Some common signs and symptoms of digestive issues include abdominal pain, bloating, gas, nausea, vomiting, diarrhoea, constipation, heartburn, acid reflux, or blood in your stool. These symptoms may indicate an underlying condition that needs medical attention such as food intolerance, allergy, infection, inflammation, ulcer, cancer, or other disorder. Your doctor can diagnose the cause of your symptoms and prescribe the appropriate treatment for you.

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