Trial on:

Can you help us find out if nutrition can optimise our immune response to the flu vaccine?

Trial ends: 18 October 2022

A new trial at King’s College London is investigating the impact of snack foods on the immune response to the flu vaccine.

Who can take part?

We are recruiting healthy volunteers, aged 40-64 years old. You may be eligible to participate if you answer ‘Yes’ to the following questions:

  • I am located in or near London to attend the study visits
  • I consume 2 or more snacks between meals each day
  • I am willing to partake in an 8-week trial and replace my habitual snacks with snacks provided to me
  • I am willing to receive the flu vaccination as part of this study 
  • I have NO history of chronic medical conditions 

What does the study involve?

  • Four visits to King’s College London (Waterloo Campus)
  • Replacing your usual snacks with study snack foods that we believe may have benefits to immune function for 8 weeks
  • Flu vaccination at week 4
  • Providing blood and stool samples on three occasions
  • Completing records of your food intake, bowel habits and gut symptoms and filling out questionnaires
  • Two follow-up phone calls to assess flu symptoms you may have experienced after completion of the intervention

What are the benefits of taking part in the study?

  • Free study-specific snacks for 8 weeks
  • Free flu vaccine
  • Receive £150 reimbursement for your time upon completion of the trial

If you are interested in taking part and want to know more, please email:

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