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Gold kiwifruit contains a range of micronutrients that contribute to health and wellbeing. Maintaining adequate levels of some these micronutrients has been associated with improved mood, feelings of vitality and bowel health.

We are investigating the role of kiwifruit in supporting psychological health and wellbeing

About the study

This study will help examine if consuming gold kiwifruit daily can lead to improvements in mood, vitality and wellbeing in people who are experiencing current psychological distress.

Participation in the study involves attending the CSIRO clinic located on North Terrace in Adelaide on four occasions and completing one additional visit which will be conducted online.

Visits will be scheduled at fortnightly intervals and each visit will require a time commitment of approximately 60 minutes. At the four clinic visits you will be asked to complete some questionnaires and provide a blood sample.

You will be supplied with all the required kiwifruit for the duration of the study.

Who can participate in this study? 

Inclusion Criteria:

  • male or female adults
  • non-smoker (i.e., no history of smoking or nicotine replacement therapy within the last six months)*
  • low blood vitamin C levels (we will test for this)
  • responses to test items on a questionnaire that assesses psychological wellbeing that identify a mild to moderate level of psychological distress*
  • fluent in English and willing to provide written informed consent
  • access to smartphone and willing to download free application from app store
  • able to access own email address/service

Exclusion Criteria:

  • aversion and/or allergy/intolerance to kiwifruit and/or latex*
  • needle phobia or fainting due to fear of needles*
  • taking vitamin C supplements within last three months of the commencement date of the study*
  • high habitual dietary intake of vitamin C
  • Diabetes Mellitus or bleeding disorders (e.g. haemophilia)*
  • taking prescription medications or probiotics for the treatment and management of gastrointestinal disorders (e.g.  Irritable Bowel Syndrome) within last three months of the commencement date of the study*
  • initiation of, or alterations to, a course of anti-depressants, anti-anxiety or anti-psychotic medication within last six months from commencement date of the study*

*Inclusion/exclusion criteria will be assessed via self-report

Note – other eligibility criteria exist and will be assessed during study screening process.

If you meet the eligibility criteria and are selected to participate in the study, you will be reimbursed a total of $200. If you choose to withdraw from the study at any time, you will be reimbursed only for the clinic visits you attend up to the date of your withdrawal.

Further information

If you have any queries about this study or would like further information about participating do not hesitate to contact us.

Please contact the lead researcher Michael Billows by email at or phone/email Dr Ian Zajac on (08) 8305 0615  or (please mention you are calling about the kiwifruit study).

If you are interested in registering to participate in this study, please visit the participate in a study page and register your details.

This study has been approved by the CSIRO Human Research Ethics Committee.

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