Uncovering the Health Benefits of Purple Potatoes
Despite extensive and ongoing research into potatoes by Agriculture and Agri-Food Canada (AAFC), new findings from the Guelph Study and Development Center of AAFC have highlighted several positive health benefits associated with the consumption of purple potatoes.
In collaboration with Yoshinori Mine from the Food Science Department at the University of Guelph, the research team—comprising Dr. Rong Cao, Hua Zhang, Ronghua Liu, Lili Mats, Dion Lepp, Honghui Zhu, and former students Yuhuan Chen and Shilian Zheng—explored the antioxidant and anti-inflammatory effects of purple potato extracts.
The Impact of Purple Potatoes on Systemic Inflammation
The research demonstrated that purple potatoes significantly impact the body’s ability to control systemic inflammation, a common underlying cause of diseases such as type 2 diabetes, heart disease, and stroke. Brightly colored fruits and vegetables, rich in polyphenols, act as powerful antioxidants and reduce inflammation.
Purple potatoes, in particular, contain anthocyanins, a type of polyphenol that can help prevent chronic diseases related to gut health by influencing the ratio of beneficial to harmful bacteria in the gut microbiome.
“Purple potatoes show tremendous potential to become a functional food because of the strong connection between reduced inflammation and prevention of gut-borne diseases and the purple pigment found naturally in these potatoes,” stated Dr. Rong Cao, Research Scientist at Agriculture and Agri-Food Canada.
In Vivo Testing of Purple Potato Extracts on Obese Mice
The research team examined the antioxidant and anti-inflammatory properties of purple potato extracts in a lab setting using obese mice fed a high-fat diet designed to mimic human diets.
“High-fat human diets can be linked to a weaker bacterial environment in the gut, which can decrease a person’s defense against inflammation-related diseases. The trials provided new insights into how highly-colored vegetables, including purple potatoes, can be instrumental in maintaining optimal gut health and help reduce the risk of diseases associated with chronic inflammation,” the experts explained.
Scientists found a clear link between purple potato polyphenols and their impact on gut bacteria. The study showed that endotoxins—poisons found in the cell walls of pathogenic bacteria and released during digestion—can greatly reduce inflammation when countered by colored vegetables.
The tests determined that a minimum dose of 75 grams of purple potato extract, administered to mice three times a week (equivalent to three potatoes), effectively prevented leaky gut syndrome and boosted immunity due to an improved gut microbiota composition.
Purple Potatoes as Prebiotics
The study’s findings indicated that anthocyanins in purple potatoes function as prebiotics, supporting the growth of beneficial bacteria in the gut microbiota.
This is crucial because a healthy intestine is vital for defending against pathogenic bacteria that cause gastrointestinal diseases. An intact intestinal lining promotes nutrient absorption and inhibits germ growth, contributing to overall health. Conversely, a compromised gut environment can lead to inflammation and a weakened immune system.
Mice fed purple potato extract exhibited not only improved intestinal health but also significantly lower blood glucose and cholesterol levels, reduced body weight gain, and decreased tissue and blood plasma inflammation.
