Sleep builds immune cells during deep sleep

Giulia describes how deep sleep (first half of night) is crucial for immune cell production and repair.

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Episode notes

What if boosting your immune system is the wrong goal?

Today, Dr Giulia Enders explains how boosting immunity may increase inflammation and why your symptoms are often part of your body’s defence. Your immune system is not failing when you feel sick. It is trying to protect you. So what should you focus on instead?

That’s the idea at the very heart of Giulia’s new book, Organ Speak. Giulia is a gastroenterologist and author whose previous book, Gut, sold eight million copies and helped convince the world that gut health was worth taking seriously.

She explains how the immune system really works and why symptoms like a runny nose, cough, or fever come from your body, not the infection itself. You’ll learn how sugar may push the immune system toward inflammation, how stress can weaken it, and why sleep is key for producing immune cells. This episode also explores how exercise helps regulate your immune response. The core idea is simple: health is not about making your immune system stronger. It is about keeping it balanced.

By the end of this episode, you will have practical ways to support that balance and habits to help your immune system respond in the right way.

If the sneezing, runny nose, fever - all of it - are actually the whole point, how much energy should you spend in suppressing them?

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Timecodes

00:00 Intro

02:45 Why being sick feels like failure

04:30 The problem with only treating the gut

07:16 Why your body is not broken

10:25 When your immune system gets overprotective

13:28 The virus may not cause your symptoms