A conversation with Karen Lee on gut health, inflammation and food
If you’ve ever wondered why gut health keeps coming up in autoimmune conditions, it’s not by chance.
In this conversation, nutritionist and former intensive care nurse Karen Lee explains why the gut sits at the centre of immune health, and how the food we eat every day can either support or strain the system.
Drawing on her own experience of living with MS, she brings a practical, realistic perspective to what can often feel like an overwhelming topic.
We cover:
- Why inflammation sits at the root of many chronic conditions
- How gut health and the immune system are closely connected
- Simple ways to start supporting your body through food
Top 5 highlights from the conversation
1. The gut plays a central role in immune health
Karen explains that around 70% of the immune system sits in and around the gut.
It acts as a protective barrier between what enters the body and what is allowed through. When this barrier is working well, it helps regulate immune responses. When it becomes disrupted, it can trigger inflammation and immune activity, which is particularly relevant in autoimmune conditions.
2. Inflammation often builds quietly over time
Many chronic conditions share a common thread of low-level inflammation.
Karen describes how this can develop gradually through a mix of diet, stress, lifestyle and environmental factors. It is not always something you notice straight away, but something that builds in the background over time.
3. The microbiome depends on fibre
The gut microbiome relies on fibre from plant foods to function well.
Karen highlights that many modern diets are low in fibre, which means beneficial bacteria are not being fed. Over time, this can lead to an imbalance that may contribute to inflammation and gut issues.
4. Autoimmune conditions are rarely caused by one single factor
Karen shares that while genetics can play a role, much of the risk is linked to environmental factors such as diet, stress, infections and lifestyle.
Often, it is a buildup over time, with one final trigger tipping the balance.
5. Small changes can make a meaningful difference
One of the most reassuring points is that change need not be extreme.
Karen encourages starting with simple additions such as more fruits and vegetables, whole grains, beans, legumes, nuts and seeds. These can begin to support the gut and reduce inflammation over time.
What you can take from this
You don’t need to change everything overnight.
For many people, the most helpful place to start is simply by adding more variety to what they already eat. That might be an extra portion of vegetables, trying a more plant-based meal, or swapping in more whole foods.
If your digestion is sensitive, introducing changes slowly can help your body adjust more comfortably.
The focus here is not on restriction. It is about supporting your body in a way that feels realistic and sustainable.
Karen also talks more in the full conversation about her own experience of living with MS, including how symptoms developed and what changes helped her regain a sense of control. Hearing this in her own words brings a deeper understanding of everything discussed here.
About the expert
Karen Lee (aka ‘The Sensitive Foodie’) is a former intensive care nurse and qualified nutritionist who has a passion for amazingly tasty food that’s also great for health. Since receiving a diagnosis of Multiple Sclerosis in 2016, she has used diet and lifestyle to manage her condition and shares this knowledge with others through her website – The Sensitive Foodie Kitchen – as well as workshops, talks and online classes. She published her first book, Eat Well Live Well with The Sensitive Foodie, in 2019. She is a facilitator for the charity Overcoming MS that provides an accessible lifestyle medicine program that supports people with MS. She also teaches medical students how to cook plant-based meals as part of the Cooking for the Climate module offered by Plant-Based Health Professionals UK and additionally works as their Events Manager, organising their nutrition and lifestyle medicine conferences. Karen lives in rural Devon with her husband and has two adult children.
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Medical disclaimer
This content is for general information only and is not a substitute for professional medical advice. Always consult your GP or a qualified healthcare professional if you have any concerns about your health.