Chardonnay grape study reveals whole foods beat isolated nutrients for metabolic health

New research studying the different forms of nutrients from Chardonnay grapes reveals that those delivered within a whole food matrix may have different health benefits than those processed as concentrated extracts for supplements. 

The randomized, controlled crossover design trial was specifically set up to demonstrate how Chardonnay nutrients affect metabolic responses in adults with mild dyslipidemia. Researchers had initially expected the polyphenol-rich extract to perform strongly due to its higher concentration of isolated compounds.

Instead, the whole-food Chardonnay grape matrix demonstrated the more favorable postprandial triglyceride response — how blood triglyceride (fat) levels change after meals — highlighting the potential importance of nutritional complexity and food-matrix effects.

“These findings reinforce the importance of the food matrix — nutrients can behave differently when delivered as part of a whole-food system than as isolated compounds,” says Fanny Lee, Ph.D., registered dietitcian and lead researcher of the study.

The trial found that the marc blend supported a more favorable post-meal triglyceride response than the seed-extract-predominant blend, despite the extract containing higher levels of isolated polyphenols.

Lowering blood pressure

The study published in Nutrition Research chose to focus on Chardonnay grapes, as they are it is the whole-fruit source material behind WellVine, marketed as a “real food prebiotic” that claims to help maintain normal blood sugar levels.

Naturally occurring nutrients delivered together within a whole-food system may behave differently than those same compounds when isolated or concentrated.While many nutrition studies focus on isolated compounds or concentrated extracts, this study suggests that naturally occurring nutrients delivered together within a whole-food system may behave differently than those same compounds when isolated or concentrated.

The research team highlights that whole grape marc delivers a naturally occurring combination of soluble and insoluble fiber, polyphenols, and prebiotic structures together. They say this system may support more integrated metabolic responses than isolated compounds alone.

Men and women between the ages of 35 and to 65 years were included in this study to increase the generalizability of the results.

Participants completed three-week intervention periods on each of three regimens: a Chardonnay grape marc-predominant blend (WellVine), a polyphenol-rich Chardonnay seed-extract-predominant blend, and a placebo. Researchers measured their fasting and post-meal responses.

According to the findings, the seed-extract-predominant blend lowered blood pressure and reduced high-density lipoprotein cholesterol, also known as “good” cholesterol. No significant changes were observed in fasting lipid markers, such as low-density lipoprotein or fasting triglycerides.

Limitations of fasting-based research

The research team notes that while metabolic health has traditionally been assessed using fasting biomarkers such as low-density lipoprotein cholesterol and triglycerides, people spend most of the day in a state of being fed.

“We spend far more of the day in a fed state than a fasted one, and post-meal triglyceride handling is increasingly recognized as an important window into cardiometabolic health,” Lee explains.

“What stood out was that the marc-predominant blend, essentially the whole-food matrix of the grape, produced the more favorable post-meal triglyceride response, even though the seed-extract blend carried higher isolated polyphenol levels.”

The research team says their findings add to a growing body of evidence supporting that post-meal bodily responses, particularly triglyceride handling, may offer insights not captured by fasting measurements alone.

“Traditional fasting lipid measurements remain important clinical tools,” they note. “However, the findings add to growing evidence that postprandial metabolic responses may provide additional insights into how the body handles nutrients after eating.”

Strong case for whole food

As discussions around the importance of whole foods grow louder in line with tightening regulations around ultra-processed foods, the researchers say their findings are relevant for product developers.

“Whole grape-derived ingredients like WellVine may offer a way to incorporate naturally occurring fiber and polyphenols into functional foods, beverages, and supplements while preserving the complexity of the original food matrix,” highlights the brand.

In other grape studies, one recent paper funded by the California Table Grape Commission, based on a small clinical trial, found that grapes boosted skin resilience against UV irradiation for two weeks by reducing the invisible internal damage caused by sun exposure.

Meanwhile, a previous study from Western New England University, UK, found that eating grapes enhanced muscle health in mice. In particular, it says that regular grape consumption changes gene expression, promoting lean muscle mass and reducing markers of muscle degeneration, with strong effects in females.