The gut–immune connection
Gut bacteria help train the immune system. Studies have linked a more diverse microbiome to better responses to certain immunotherapies.
Fibre feeds helpful bacteria
Whole grains, legumes, vegetables and fruit provide fibre that gut bacteria turn into anti-inflammatory compounds.
Be careful with probiotics
Some research suggests over-the-counter probiotic supplements may not help during immunotherapy. Ask your oncologist before starting any.
How gut bacteria train the immune system
Gut microbes send signals that help immune cells recognise threats. Studies suggest a diverse microbiome may be linked to better immunotherapy response.
Diet strategies that may help
Practical steps:
- Eat a wide variety of fibre-rich plants
- Include polyphenol-rich foods — berries, green tea, cocoa
- Add fermented foods like curd if tolerated
- Avoid starting probiotics without asking your oncologist
Protecting the gut lining
Gentle, well-cooked foods and good hydration help when treatment irritates the gut.
Frequently asked questions
What diet supports immunotherapy?
A varied, high-fibre, whole-food diet, agreed with your care team.
Should I avoid antibiotics?
Only take antibiotics when prescribed. Your doctor balances their need against effects on the microbiome.
Should I take probiotics during immunotherapy?
Only with your oncologist's approval — some studies suggest over-the-counter probiotics may not help and could reduce diversity.
Written by Dr. Jai Vora. This article is for education only. Speak with your doctor before changing medication, diet or treatment.