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Olive Oil Hunter #247

Posted on by The Olive Oil Hunter

Winter Salad Recipe, Spotlight on Homemade Vinaigrettes, Prepping Greens, A New Benefit of Vitamin D, and Aerobics for Knee arthritis

Salads aren’t just for summer, and if one of your New Year’s resolutions is to eat more fruits and veggies, this winter greens recipe fits the bill. I’ve dressed it with a sweet-tart vinaigrette that you can use with a variety of foods for lighter eating. I’m also sharing two new important findings: how vitamin D can help people avoid a second heart attack and a surprising way to manage knee arthritis.

Winter Salad

  • Winter Pear Salad Winter Salad

    Using sweet and tart vinegars adds complexity to this vinaigrette, which is a delicious foil for the slightly bitter greens and sweet pears.

    Ingredients

    For Vinaigrette:

    • 1 tablespoon red wine vinegar, such as Austrian Red Wine Vinegar
    • 1 tablespoon balsamic vinegar of Modena, such as Condimento Barili Exclusivi
    • 1/2 tablespoon Dijon mustard
    • 1/2 tablespoon honey
    • 1/4 teaspoon coarse sea salt, plus more to taste
    • 1/2 garlic clove, minced 
    • 1/3 cup extra virgin olive oil
    • Freshly ground black pepper to taste

    For the Salad:

    • 1/2 cup hazelnuts or walnut halves
    • 4 to 6 cups baby spinach, baby kale, escarole, or other winter greens, rinsed and dried
    • 2 ripe pears, cored and thinly sliced
    • Block of Parmigiano-Reggiano or 2 ounces mild blue cheese

    Directions

    Step 1

    Make the vinaigrette: In a medium mixing bowl, whisk together the vinegars, mustard, honey, salt, and garlic. Gradually whisk in the olive oil until the dressing is emulsified. Season to taste with pepper and more salt, if desired.

    Step 2

    Make the salad: Heat a small sauté pan. When hot, add the nuts and toast for 2 minutes until they become fragrant, tossing frequently; set aside.

    Step 3

    Divide the greens among 4 salad plates and top with equal amounts of pear slices and nuts. If using Parmigiano-Reggiano, use a cheese plane to make long shavings over each salad. If using blue cheese, crumble it. Drizzle a spoonful of vinaigrette over each salad and pass the rest on the side.

    Yields 4 servings

Healthy Ingredient Spotlight: Homemade Vinaigrettes

Healthy Ingredient Spotlight

Homemade Vinaigrettes

Homemade Vinaigrette

It’s no secret that most bottled dressings are loaded with sugar, artificial ingredients, and poor- quality oil. On the other hand, it’s so easy to make your own with just a few quality ingredients. Vinaigrettes can be made with a whisk, but using a blender or mini food processor can make fast work of it, especially if some ingredients need to be chopped or minced. As a general rule, you can pulse all the ingredients except the olive oil for a few seconds—let the machine mince any herbs, garlic, or shallots for you. Then with the machine still running, slowly add the olive oil through the feed tube until the vinaigrette is emulsified. Vinaigrette will keep for up to a week in the fridge; shake well or whisk as needed before using.

Quick Kitchen Nugget: Prepping Greens

Quick Kitchen Nugget

Prepping Greens

To maximize taste when making salads, prep your greens by rinsing and drying them in a salad spinner or with an absorbent kitchen towel—dressing coats them better when they’re dry and won’t be diluted by water clinging to the leaves. Rather than simply pouring vinaigrette over your salad, mix it in with two forks or tongs to really dress the greens. Also, keep in mind that vinaigrettes aren’t just for salads—drizzle them over roasted vegetables, grains, and cold meats. 

For Your Best Health: A New Benefit of Vitamin D

For Your Best Health 

A New Benefit of Vitamin D

In a large randomized clinical trial, researchers from Intermountain Health in Salt Lake City found that managing the vitamin D levels of people who experienced a heart attack through a “target-to-treat” approach, with blood levels monitored and dosages adjusted to reach an optimal range, cut the likelihood of a second heart attack by 50%. The findings were presented on Nov. 9 at the 2025 American Heart Association Scientific Sessions in New Orleans.

According to researchers, the results carry global importance, as between one-half and two-thirds of people worldwide have low levels of vitamin D. In the past, most individuals received sufficient vitamin D through sunlight exposure. Today, with lifestyle changes and medical advice aimed at reducing skin cancer risk, people spend less time in the sun and must rely more on dietary supplements such as vitamin D3 to maintain healthy levels.

Low vitamin D levels have long been linked to poor cardiovascular outcomes in observational studies. However, earlier clinical trials that provided standard supplementation doses failed to show measurable reductions in heart disease risk. Intermountain scientists wanted to test a different idea: Rather than giving everyone the same dose, what if supplementation was adjusted to reach a specific healthy vitamin D level?

“Previous studies just gave patients supplementation without regularly checking blood levels of vitamin D to determine what supplementation achieved,” said Heidi May, PhD, cardiovascular epidemiologist at Intermountain and the study’s principal investigator. “With more-targeted treatment, when we checked exactly how supplementation was working and made adjustments, we found that patients had their risk of another heart attack cut in half.” 

The Intermountain study, called the TARGET-D trial, ran from April 2017 to May 2023 and included 630 patients who had suffered a heart attack within a month of enrolling. Participants were followed until March 2025 to monitor cardiovascular outcomes.

Patients were randomly assigned to one of two groups: One received no vitamin D management and the other underwent active, targeted vitamin D3 treatment. The goal for the treatment group was to raise blood levels of vitamin D to above 40 nanograms per milliliter (ng/mL). At the start, 85% of participants had blood levels of vitamin D below that threshold. More than half of the patients receiving targeted therapy required an initial dose of 5,000 international units (IUs) of vitamin D3 compared to typical supplement recommendations of 600-800 IUs.

Blood levels of vitamin D were checked annually for those maintaining healthy levels. Patients with lower levels were tested every three months and had their dosage adjusted until reaching the 40 ng/mL target. Afterward, their levels were monitored once a year.

Researchers tracked major cardiac events, including heart attacks, strokes, heart failure hospitalizations, and deaths. Out of 630 participants, 107 experienced such events. While there was no significant difference in the overall risk between the two groups, the chance of having a second heart attack was cut in half among those receiving targeted vitamin D3 treatment.

“We’re excited with these results but know we have further work to do to validate these findings,” said Dr. May. Researchers plan to expand their work with a larger clinical trial to confirm and build upon these findings. “A larger study group will allow us to more fully evaluate whether targeted vitamin D management can reduce not only repeat heart attacks but also other forms of cardiovascular disease,” she said.

Fitness Flash Icon: Knee arthritis? Try Aerobics! 

Fitness Flash

Knee arthritis? Try Aerobics!

A sweeping review of 217 studies representing 15,684 participants found that aerobic exercises like walking and cycling offer the best pain relief and mobility gains for knee osteoarthritis. Compared to other types of exercise, aerobic training showed the strongest evidence across short- and long-term outcomes. All forms of exercise were found to be safe, but experts recommend making aerobic activity the foundation of treatment as it’s the most effective for easing pain, improving movement, and enhancing overall quality of life.

Osteoarthritis develops when the cartilage cushioning the ends of bones wears down, leading to swelling, stiffness, and discomfort. It can affect any joint, but the knees are most commonly impacted. About 30% of adults over age 45 show signs of knee osteoarthritis on X-rays, and roughly half of them experience significant pain and mobility problems.

Exercise is a cornerstone of osteoarthritis care, yet many medical guidelines lack clear direction on which kinds are most beneficial for knee osteoarthritis specifically. To clarify this, researchers analyzed the effectiveness and safety of several exercise approaches.

Exercise for knee arthritis

The trials varied in quality, but the team assessed the strength of the evidence using the internationally recognized GRADE (Grading of Recommendations Assessment, Development and Evaluation) system. They examined several key outcomes: pain reduction, physical function, gait performance, and quality of life. Each was measured at short-term (4 weeks), mid-term (12 weeks), and long-term (24 weeks) follow-ups. Across these studies, aerobic exercise consistently ranked highest in improving outcomes among all exercise types tested.

Other exercise forms showed value too. Mind-body workouts likely provided a notable improvement in short-term function, neuromotor exercises likely boosted short-term gait performance, and strengthening or mixed routines improved function in the mid-term. Importantly, none of the exercise types resulted in more adverse effects than the control groups, indicating that these therapies are generally safe.

The authors did acknowledge some study limitations. Many results came from indirect comparisons, certain outcomes lacked long-term data, and smaller studies may have influenced some early findings. Despite these limitations, the researchers describe their work as one of the most complete and current evaluations of exercise for managing knee osteoarthritis. They believe the findings, which were published in The BMJ, will help doctors make more-targeted recommendations.

Based on the evidence, the team advises aerobic exercise “as a first-line intervention for knee osteoarthritis management, particularly when the aim is to improve functional capacity and reduce pain” and says if aerobic exercise is not possible owing to individual limitations, “alternative forms of structured physical activity may still be beneficial.”

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Hydroxytyrosol from Olives Is a Neuroprotective Agent

Posted on by The Olive Oil Hunter

One of the most powerful polyphenols in olive oil is hydroxytyrosol. Consuming hydroxytyrosol is linked to benefits in neurological, cardiovascular, and metabolic health, and the compound has demonstrated anti-inflammatory, anti-cancer, neuro-protective, and immuno-protective effects. A recently published scientific review in the journal Foods examines the growing body of evidence supporting the characterization of hydroxytyrosol as a “functional food,” with emphasis on its effects on neurological and cognitive processes.

What is it?

Hydroxytyrosol (hi-droxy-TY-roh-sol), abbreviated as HXT, is a phenol, a natural chemical that is both water-soluble and attracted to fats, which means that it can pass through cell membranes. Its chemical structure also explains its strong antioxidant and anti-inflammatory properties. HXT occurs mainly in olives—olive oil, fruit, leaves, and pulp—as well as in red and white wines.

What does HXT do in the brain?

HXT interacts with the brain and its vascular (blood vessel) system in 3 ways: 1) as an antioxidant and anti-inflammatory agent, HXT helps prevent damage to cerebral blood vessels and improves their function; 2) lab studies show that, by reducing oxidation and inflammation, HXT helps maintain the proper functioning of the blood-brain barrier (BBB), a crucial filter inside the brain’s blood vessels that controls what substances enter and exit the brain; 3) in studies in humans, consuming HXT in the form of high-phenolic EVOO resulted in less “leakage” across the BBB and, as reflected in participants’ performance on cognitive tests, improved connectivity between brain regions.

HXT and its metabolites (the components of a substance that are formed when metabolic processes, such as digestion, break it down) are able to cross the BBB to interact with specific brain processes, enhancing protective activity and dampening inflammatory activity that is linked to depression and cognitive decline.

How much HXT is needed to obtain its benefits?

In studies in humans, the above benefits were observed with an HXT intake ranging from 7 to 15 mg/day. In terms of EVOO, this translates to a daily consumption of about 25 to 50 ml of high-phenolic olive oil, or ~2 to 3 tablespoons. Table olives—regardless of their color or brining—also provide an excellent source of HXT.

What’s next for HXT?

This body of promising evidence has intensified interest in the development of HXT-enriched foods and other ways of delivering this health-promoting compound. HXT is highly bioavailable, which means that, after it is consumed and digested, it is readily absorbed and transported by the body. So, for now—perhaps for always—the most effective, efficient, and delicious way to obtain the neuroprotective benefits of HXT is “food-first,” via high-phenolic EVOO.

Reference: Martínez-Zamora Z. Foods 2025;14(21):3624.

Olive Oil Hunter News #238

Posted on by The Olive Oil Hunter

Cold Seafood Salad Recipe, Spotlight on Yuzu Rice Wine Vinegar, Overcooking Shellfish, Controlling High Blood Pressure, Plus Exercise and Your Appetite

I love elegant dishes that deliver on taste with a minimum of effort, and my take on a seafood salad is perfect at any time because the ingredients are always available—flash-freezing makes it possible to find them year-round in the freezer case. Another reason to love this dish is that it doesn’t call for any added salt, a contributor to high blood pressure. Read on for other ways to limit sodium in your diet.

Cold Seafood Salad

  • Cold Seafood Salad Cold Seafood Salad

    You can enhance this medley, perfect for a light lunch or dinner, with steamed mussels or, for pure indulgence, lobster chunks.

    Ingredients

    • 1 pound shrimp, peeled and deveined
    • 1/2 pound cleaned calamari, cut into rings 
    • 1 pound sea scallops, preferably the dry type
    • 20 cherry tomatoes, halved
    • 1 small red onion, cut into rings
    • 3 tablespoons extra virgin olive oil
    • 1 tablespoon Yuzu Rice Wine Vinegar
    • Juice of half a lemon, plus more to taste
    • 1/4 cup chopped fresh flat-leaf parsley leaves
    • Freshly ground black pepper to taste

    Directions

    Step 1

    Prepare an ice bath: Set out a very large bowl and fill it halfway with water, then add 2 cups of ice. 

    Step 2

    Boil the shrimp in a large pot of water until pink, about 5 minutes; use a large strainer to scoop them out and into the ice bath to cool. Add the calamari rings to the boiling water and cook for 2 minutes; use the strainer to scoop them out and into the ice bath. Turn the heat in the cooking pot down to a simmer, add the scallops, cover, and take off the heat; wait 4 minutes, and then use the strainer to scoop them out and into the ice bath. After 5 minutes, drain the seafood and place in a serving bowl along with the tomatoes and onion rings.

    Step 3

    Whisk the olive oil, vinegar, and lemon juice in a small bowl. Add the parsley, then pour over the seafood. Toss lightly, taste, and season with pepper and more lemon juice as desired.

    Yields 4 servings

Healthy Ingredient Spotlight: Austrian Red Wine Vinegar

Healthy Ingredient Spotlight

Yuzu Rice Wine Vinegar

Condimento Bianco Menta

Each year, as I contemplate the potential vinegar choices for the T. J. Robinson Curated Culinary Selections, I always want to include a rather exotic one to surprise and delight you. Yuzu Rice Wine Vinegar is exactly that. 

Rice wine vinegar is such an important ingredient in Asian cooking. It’s made from sake, the beloved rice-based Japanese drink. The sake for this vinegar is American-made, a junmai-grade sake from California. Junmai means that it’s pure—nothing other than rice is added to the fermenting mixture. The rice wine is not seasoned, meaning it has no sugar added; it has just the mellowness that comes from aging.

For a completely one-of-a-kind creation, I had the idea to enhance this vinegar with yuzu. Yuzu is an Asian citrus fruit with a strong perfumed aroma and a highly complex flavor profile with notes of grapefruit, lemon, and mandarin orange—it’s tart, sweet, and floral all at the same time. Its thick and bumpy rind goes from green to yellow as it ripens, and its milky yellow juice has deep flavor. It took a lot of experimenting with proportions to find just the right balance of yuzu juice and rice wine so that both tastes would come through, and then it was rounded out with organic blue agave for a little bit of sweetness. The result is a sweet-tart vinegar with a flavor that will wow you as much as it did me.

Quick Kitchen Nugget: Don’t Overcook Shellfish

Quick Kitchen Nugget

Don’t Overcook Shellfish

No one likes rubbery seafood—one bad experience can turn you off to these gifts from the ocean. It’s especially easy to overcook calamari and scallops since, unlike shrimp, their color doesn’t change dramatically when they’re done. However, they do go from translucent to opaque, often in just a few minutes. If you keep cooking beyond this point, they will become tough. Even if you scoop them out of the cooking liquid, the cooking process will continue until the heat dissipates, which is why I suggest dropping them in an ice bath right away.

Shrimp and whole lobsters will turn a bright red-orange as soon as they’re done. Seafood in the shell, like clams, mussels, and oysters, should be steamed on a rack over simmering water just until their shells open. This can take as little as 5 minutes or up to 10, depending on size, so keep watch. They don’t need the ice bath, but it should be used right away.

For Your Best Health: Controlling High Blood Pressure

For Your Best Health

Controlling High Blood Pressure

Despite strong evidence that salt substitutes can safely lower sodium intake and reduce high blood pressure, very few Americans use them, according to preliminary research presented at the American Heart Association’s Hypertension Scientific Sessions 2025. A new analysis of nearly 20 years of national health data found that usage peaked at just over 5% and then declined, even among those with hypertension. Researchers say this represents a major missed opportunity to improve heart health.

High blood pressure occurs when the force of blood flowing through the blood vessels is consistently too high. High blood pressure can lead to other serious events such as heart attack and stroke. Data from 2017 to 2020 showed that 122.4 million American adults had high blood pressure and that high blood pressure contributed to more than 130,000 deaths. Too much sodium and too little potassium in the diet are risk factors for high blood pressure.

“Overall, less than 6% of all US adults use salt substitutes, even though they are inexpensive and can be an effective strategy to help people control blood pressure, especially people with difficult-to-treat high blood pressure,” said lead study author Yinying Wei, MCN, RDN, LD, and PhD candidate in the departments of applied clinical research and hypertension section, cardiology division, at UT Southwestern Medical Center in Dallas. “Healthcare professionals can raise awareness about the safe use of salt substitutes by having conversations with their patients who have persistent or hard-to-manage high blood pressure.”

Salt substitutes are products that replace some or all of the sodium with potassium. Potassium salt tastes similar to regular salt, except it can have a bitter aftertaste if it’s been heated. Many foods contain some sodium in their natural state; however, the largest amount of sodium comes from processed and packaged foods and meals prepared at restaurants. The American Heart Association recommends consuming no more than 2,300 mg of sodium a day, with an ideal limit of less than 1,500 mg per day for most adults, especially for those with high blood pressure. For most people, cutting back by 1,000 mg a day can improve blood pressure and heart health.

The investigation focused on people with high blood pressure, and an additional analysis was conducted among adults eligible to use salt substitutes, including people with normal kidney function and those not taking medications or supplements that affect blood potassium levels. Some salt substitutes contain potassium, and they can raise blood potassium to dangerous levels in people with kidney disease or those taking certain medications or potassium supplements. Excessive potassium can lead to irregular heart rhythms. People with high blood pressure who are thinking about switching from regular salt to a salt substitute should first consult with a healthcare professional.

The study did have some limitations, said the authors. First, information about salt substitute use was self-reported, so there may have been underreporting or misclassification. In addition, all types of salt substitutes were included in the analysis; therefore, the analysis could not specifically separate potassium-enriched salt from other types of salt substitutes. Finally, the survey data did not capture how much salt substitute the participants used.

“Future research should explore why salt substitute use remains low by investigating potential barriers, such as taste acceptance, cost, and limited awareness among both patients and clinicians,” said Wei. “These insights may help guide more targeted interventions.”

Salt substitutes aren’t the only options for adding more flavor to foods. According to the American Association of Heart Failure Nurses, pure herbs and spices, such as garlic, onion, and chili powder, are great choices. Just make sure you aren’t using garlic salt or onion salt. 

Fitness Flash: Exercise and Your Appetite

Fitness Flash

Exercise and Your Appetite

Researchers at Baylor College of Medicine, Jan and Dan Duncan Neurological Research Institute (Duncan NRI) at Texas Children’s Hospital, Stanford University School of Medicine, and collaborating institutions recently shared new insights into how exercise helps with weight loss. They discovered a mechanism by which the compound Lac-Phe, which is produced during exercise, reduces appetite in mice, leading to weight loss. The findings appeared in Nature Metabolism.

“Regular exercise is considered a powerful way to lose weight and to protect from obesity-associated diseases, such as diabetes or heart conditions,” said co-corresponding author Yang He, PhD, assistant professor of pediatrics-neurology at Baylor and investigator at the Duncan NRI. “Exercise helps [people] lose weight by increasing the amount of energy the body uses; however, it is likely that other mechanisms are also involved.”

The researchers previously discovered that Lac-Phe is the most increased metabolite—a product of the body’s metabolism—in blood after intense exercise, not just in mice but also in people. They had also shown that giving Lac-Phe to obese mice reduced how much they ate and helped them lose weight without negative side effects. But until now, scientists didn’t fully understand how Lac-Phe helps suppress appetite.

“Understanding how Lac-Phe works is important for developing it or similar compounds into treatments that may help people lose weight,” Dr. He said. “We looked into the brain as it regulates appetite and feeding behaviors.”

The researchers studied two types of brain cells in mice: AgRP neurons, which stimulate hunger and are found in the arcuate nucleus of the hypothalamus, and PVH neurons, found in the paraventricular nucleus of the hypothalamus. Normally, AgRP neurons send signals that inhibit PVH neurons, making you feel hungry. But when AgRP neurons are turned off, PVH neurons become more active, reducing appetite.

The team discovered that Lac-Phe directly inhibits AgRP neurons, which in turn activates PVH neurons. This chain of events resulted in the mice eating less. The animals’ behavior remained normal, suggesting that Lac-Phe doesn’t cause unpleasant side effects. “We found that Lac-Phe acts on a protein on AgRP neurons called the KATP channel, which helps regulate cell activity. When Lac-Phe activates these channels in AgRP neurons, the cells become less active,” Dr. He said. “When we blocked the KATP channels using drugs or genetic tools, Lac-Phe no longer suppressed appetite. This confirmed that the KATP channel is essential for Lac-Phe’s effects.”

This research helped explain how exercise can naturally reduce appetite and improve metabolism. “The results also suggest the exciting possibility of targeting this newly discovered mechanism for weight management,” said co-corresponding author Yong Xu, PhD, currently at the University of South Florida.

Although this study focused on mice, the findings are promising for people. Future research will explore how Lac-Phe works in different metabolic states (like obesity vs. leanness), how it travels to the brain, and whether it can be used safely and effectively as a therapy.

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Olive Oil Hunter News #225

Posted on by The Olive Oil Hunter

Caprese Bites Recipe, Spotlight on Summer Squash, Foods that Lower Blood Pressure plus Exercise and Vitamin D Levels

Have a bumper crop of summer squash? Turn a Caprese salad into succulent morsels wrapped in slices of summer squash for a great light meal or party-ready hors d’oeuvres. If you’re a tea or chocolate lover, you’ll be pleased to read about the effects of a micronutrient found in them as well as in apples and grapes. Summer is a great time to add to vitamin D stores—a new study outlines how to better maintain levels come winter.

Caprese Bites

  • Zucchini-wrapped caprese bites Caprese Bites

    Baked summer squash strips are perfect for making finger food roll-ups. For this recipe, I’m filling them with the ingredients of a classic Caprese salad, one of my favorite seasonal dishes. Try to choose squash that are the same thickness from tip to base.

    Ingredients

    • Two 6- or 7-inch yellow summer squash or zucchinis
    • Extra virgin olive oil 
    • Coarse sea salt
    • 8 ounces fresh mozzarella
    • 12 cherry tomatoes, more as needed, halved
    • Basil leaves, to taste
    • Garlic chives (optional)
    • Balsamic vinegar of Modena
    • Freshly ground black pepper, to taste

    Directions

    Step 1

    Preheat your oven to 375°F. Use the straight blade of a box grater or a mandoline to slice the squash into lengths about 1/8-inch thick. Each squash should yield about 8 slices.

    Step 2

    Arrange the squash slices on a rimmed sheet pan lined with parchment paper and lightly brush with olive oil, then sprinkle with salt. Bake for about 15 minutes until soft but not browned. Remove the pan from the oven and let cool.

    Step 3

    Cut the mozzarella into thin lengths; they should be about the width of each squash slice and a third as long. Center a piece of mozzarella on a squash length, top with a cherry tomato half, pressing it in to anchor it, and then with a basil leaf. Roll up the squash and tie it with a chive or secure it with a toothpick. Arrange the bites on a serving dish and drizzle with balsamic and more olive oil. Sprinkle on salt and black pepper to taste.

    Yields 4 to 8 servings

Healthy Ingredient Spotlight: Summer Squash

Healthy Ingredient Spotlight

Summer Squash

Whether you’re choosing yellow squash or zucchini, these thin-skinned veggies are very versatile—they can be enjoyed raw or cooked and don’t need peeling. A key difference between the two varieties is size. While most yellow squash are on the short side, zucchini can be short or long, thick or thin. Similarities include their nutritional profile with good amounts of vitamins A and C, potassium and magnesium, and fiber. When shopping, choose firm vegetables without soft spots and treat them with care because those thin skins can get nicked or bruised easily.

Summer squash
Quick Kitchen Nugget: Storing Summer Squash

Quick Kitchen Nugget

Storing Summer Squash

Summer squash will keep for up to a week in the crisper drawer of your fridge, wrapped in paper towel and then in a cloth vegetable bag for protection. 

For Your Best Health: Foods that Lower Blood Pressure 

For Your Best Health

Foods that Lower Blood Pressure

Apples and grapes - high in flavan-3-ols

A study from the University of Surrey in the UK has found that naturally occurring compounds called flavan-3-ols, a subgroup of flavanols, may improve blood pressure and the health of blood vessels. The research, published in the European Journal of Preventive Cardiology, analyzed data from 145 randomized controlled studies and found that regular consumption of flavan-3-ols, found in cocoa, tea, apples, and grapes, can lead to a reduction in blood pressure readings, particularly in people with elevated or high blood pressure. In some cases, the average blood pressure-lowering effects were comparable to those seen with some medications.

Flavan-3-ols were also found to improve the function of the endothelium, the inner lining of blood vessels, which is crucial for overall cardiovascular health. This improvement occurred independently of blood pressure changes, suggesting a broader positive impact on the circulatory system.

“The findings are encouraging for those looking for accessible ways to manage their blood pressure and support their heart health through enjoyable dietary changes,” said Dr. Christian Heiss, lead author of the study and professor of cardiovascular medicine at the University of Surrey. “Incorporating small amounts of commonly consumed foods like tea, apples, dark chocolate, or cocoa powder into a daily balanced diet could provide beneficial amounts of flavan-3-ols. While not a replacement for prescribed medications or medical advice, including more flavan-3-ol-rich foods in a daily routine could be a valuable addition to a healthy lifestyle, especially for those with higher blood pressure. These are findings that, although promising, require ongoing investigation.”

Fitness Flash: Exercise and Vitamin D Levels

Fitness Flash

Exercise and Vitamin D Levels

With all its outdoor activities, summer is a great time to naturally boost the body’s vitamin D levels. But how can you maintain those levels come winter? A study from the University of Bath, University of Birmingham, University of Cambridge, and others in the UK, published in Advanced Science, has found that regular moderate-intensity exercise helps maintain crucial vitamin D levels during the darker months.

Participants who were either overweight or obese and who completed a 10-week indoor exercise program over winter experienced significantly smaller drops in vitamin D levels compared to those who didn’t exercise, even though their body weight was deliberately maintained. The program involved four sessions per week: two treadmill walks, one longer steady-state bike ride, and one high-intensity interval bike session.

Notably, exercise completely preserved the body’s active form of vitamin D (1,25(OH)₂D₃), which plays a key role in supporting bone health, the immune system, and various organs. Previous studies suggested that vitamin D supplements alone do not help maintain this active form.

Key findings:

  • People who exercised saw a smaller drop in their overall vitamin D levels over winter—about 15 percent compared to a 25 percent drop in those who didn’t exercise.
  • Those who exercised kept healthy levels of the active form of vitamin D, which helps support the immune system and bone health.
  • Weight was kept stable throughout the study, indicating the effect was due to exercise—not weight loss.

To ensure sunlight didn’t skew the results, the study ran between October and April, when natural vitamin D production from sunlight is minimal in this part of the UK, and participants were asked to avoid supplements.

A previous study from the team showed that a single workout can briefly boost vitamin D levels. This is the first one to show that regular cardio exercise can maintain basal circulating vitamin D levels and offer lasting protection during the winter months.

As Oly Perkin, PhD, lead author and lecturer from the Centre for Nutrition, Exercise and Metabolism at the University of Bath explained, this is the first study to show that exercise alone can protect against the winter dip in vitamin D. It’s a powerful reminder that we still have lots to learn about how exercise benefits our health.

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