A rare exception: an industry-funded study with negative results

As I endlessly repeat, industry-funded studies tend to favor the sponsor’s commercial interests.  The correlation between industry funding and study outcome is not 100% however.  Exceptions do occur.

Here’s one sent to me by a reader, Matthew Kadey: “Marion, a rare industry funded study with results that likely did not please the sponsors.”

The study: Effects of one avocado a day for six months on cognitive performance in overweight adults: A randomized controlled trial. The Journal of nutrition, health and aging. Volume 30, Issue 6, June 2026, 100847.  https://doi.org/10.1016/j.jnha.2026.100847.

Objective: “To determine if consuming one avocado per day for 6 months has cognitive benefits in adults with central obesity, addressing cognitive health early in the aging trajectory.”

Conclusions: “The consumption of one avocado per day without any additional lifestyle modifications for six months did not significantly alter cognitive function in adults with central obesity across all age groups. Additional work is needed to determine whether avocados, as part of dietary strategies initiated in midlife, contribute to healthy cognitive aging, particularly in normal weight and metabolically vulnerable populations.”

Funding disclosure: “This study was funded by the Hass Avocado Board in Mission Viejo, California”

Competing interests: Nine of the eleven authors report financial support from the Hass Avocado Board Avocado Nutrition Center.

Comment: I could not imagine why anyone would do this study in the first place.  It is a rare example of one that produced negative result from an industry-funded study, but note the positive spin in the conclusions: “Additional work is needed to determine whether avocados, as part of dietary strategies initiated in midlife, contribute to healthy cognitive aging, particularly in normal weight and metabolically vulnerable populations.”

Really?  Why?  I can’t think of any reason why more studies like this would be needed, except to get more funding from the Hass Avocado Board, which seems willing to spend lots on research aimed at positioning avocados as superfoods.

Note:  All fruits and vegetables have nutritional benefits.  By these criteria, all are superfoods.