What happens in your abdomen has a major effect on your overall health, but people don't like to talk about the well-being in your gut. Time for 5 facts about the largest organ in your body.

Did you know, for example, that your immune system is largely in your intestines? And that nobody has the same gut flora as you? These are five things you need to know about your belly.

1. Nine meters of organs to digest food
The human gastrointestinal tract consists of a number of organs connected in the vertical direction. This channel can be up to nine meters long and is responsible for the digestion, absorption of nutrients and the excretion of waste.

2. Your intestines consist mainly of bacteria
There are approximately one hundred trillion bacteria in your digestive tract, including your intestines. All these bacteria together are the microbiome in your intestines, also known as intestinal flora. The intestinal flora is unique for everyone. The bowel movement is therefore different for everyone.

3. Nutrition has an effect on your intestinal flora
The composition of your intestinal flora is determined by various factors, such as genetics, medication use and nutrition. A diverse gut flora is generally better. More diversity in gut bacteria is associated with better health.

Research from the University Medical Center Groningen shows that nutrition has an effect on the intestinal flora. Research results show that some foods have a positive effect on the diversity of the intestinal flora, such as buttermilk, tea, fruit and vegetables.

4. Most of your immune cells are in your intestines
Your intestines not only digest, they are an important part of the immune system and offer protection against disease. No less than seventy to eighty percent of your immune cells are concentrated in the intestines, research into allergies and the gastrointestinal tract shows. That is why a diverse intestinal flora contributes to a properly functioning immune system.

5. Your intestines can determine how you feel
Various research results show that substances produced in the intestines can affect your brain. In the intestines there is a kind of second brain that communicates with the real brain, Dr. Michael Mosley investigated. This could show that changing the types of bacteria in your intestines could affect your mental health.

This article was sponsored by Activia

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