Industry-funded studies of the week: One Potato, Two Potato
Thanks to David Ludwig for alerting me to an e-mail from the Alliance for Potato Research & Education (APRE), a trade association “dedicated to advancing the scientific understanding of the role potatoes play in promoting the health of all people.”
A new APRE-funded study published in Nutrients investigated the effect of increased dietary potassium from a whole food source – baked/boiled potatoes and baked French fries – or a potassium supplement on blood pressure and other cardiovascular disease risk factors compared to a ‘typical American’ control diet (lower potassium intake) among 30 pre-hypertensive-to-hypertensive men and women.
Results showed that baked/boiled potato consumption had the greatest benefit on reducing sodium retention, even more than the supplement, and resulted in a greater reduction in systolic blood pressure (SBP) compared to the control diet.
Further, despite commonly held misbeliefs about French fries and their role in heart-healthy lifestyles, the authors observed that a 330-calorie serving of baked French fries, when eaten as part of a ‘typical American’ diet, had no adverse effect on blood pressure or blood vessel function.
The study concludes:
This was the first controlled feeding study of potassium from food and supplements on BP and CVD outcomes in an unhealthy population…Of public health relevance is our observation that French fries in amounts typical of a large serving in a fast food restaurant has no adverse effect on blood pressure or endothelial function.
It discloses the funding source: “This research was funded by Alliance for Potato Research and Education.”
Comment: Because some (but not all) observational studies have linked potatoes, and especially French fries, to poor health outcomes, the potato industry wants research to give these foods a healthier image. This study says that potatoes are high in potassium and a high potassium-to-sodium ratio is good for blood pressure and heart disease. I could have told them that on the basis of food composition data alone: 100 grams of French fries contains 435 mg potassium versus 295 of sodium. Does that make French fries a health food? No, alas, it does not.
Once more for the record: industry-funded research is about marketing, not public health.
Last week, I received an emailed notification from APRE, the Alliance for Potato Research & Education announcing a new study.
For decades, people have often associated higher intakes of carbohydrate-containing foods with less healthy lifestyles. Yet, evidence suggests this view is overly simplistic, and it is instead the type and quality of carbohydrate foods that matter most for supporting health…In a newly published perspective in Nutrients, a group of nutrition researchers, who collectively make up the Quality Carbohydrate Coalition-Scientific Advisory Council (QCC-SAC), outline the opportunity for a stronger, more evidence-based approach to defining quality carbohydrate foods to support overall health and provide clearer dietary guidance.