Mental HealthNewsletter

Do kiwifruits improve mood?

Executive summary

* A paper has recently been published about a three-way intervention trial (involving 155 people) conducted in New Zealand. Participants needed to have low vitamin C levels.

* One third of the participants were given 250mg vitamin C daily, one third were given a placebo tablet, and the remaining third were given two SunGold® kiwifruit daily.

* The trial was not randomised, and this led to differences between the three groups, which needed to be adjusted for.

* The study claimed that kiwifruit could improve mood in as few as four days. After adjustment, there were no differences between vitamin C and placebo or kiwifruit and placebo.

* The researchers created a subset of people differently low in vitamin C and claimed results for these. We don't know if these data were adjusted. (Update - correspondence with the lead author confirmed that these data were not adjusted. There were therefore no results post adjustment).

* The NZ team have been involved in this research since 2017. The first claims for kiwifruit were made in 2020. This paper is more of the same.

* The authors reported no conflicts of interest. The study was funded by Zespri International Limited, which is the world's largest marketer of kiwifruit.


The rest of this article is available to site subscribers, who get access to all articles plus a weekly newsletter.
To continue reading, please login below or sign up for a subscription. Thank you.