Even those who follow the guideline to consume five daily servings of fruits and vegetables may not be absorbing an adequate amount of beneficial substances for cardiovascular health. A study published in the journal Food & Function, which analyzed data from over 30,000 individuals in the United States and the United Kingdom, points to this issue.
The researchers investigated whether current healthy eating guidelines are sufficient to ensure the intake of approximately 500 milligrams of daily flavonoids, which are bioactive compounds naturally found in vegetable foods and belong to the flavonoid family. These compounds help improve vascular function, promote nitric oxide production (which leads to artery dilation), and possess antioxidant and anti-inflammatory properties.
The team evaluated participants' dietary patterns using urinary biomarkers to objectively estimate the consumption of these compounds. The findings indicate that people with higher quality diets and greater consumption of fruits and vegetables do indeed ingest more flavonoids. However, less than 25% of those who follow nutritional recommendations reach the quantity considered beneficial for the heart.
Importance of dietary diversification
According to the authors, this disparity occurs because not all types of fruits and vegetables contain the same concentration of these compounds. Nutritionist Letícia do Vale Pires, from Einstein Israelite Hospital, comments that although there are no official recommendations yet regarding the daily intake of flavonoids, the studies reinforce the need for a diet rich and varied in plant-based products.
Important sources of flavonoids include green tea and black tea, cocoa, apple with skin, grapes (especially purple ones), pear, and berries. Although greens, vegetables, and legumes also contain these compounds, their concentrations tend to be lower.
The specialist advises focusing on variety, alternating the fruits consumed, keeping the skin whenever possible, incorporating beans and other legumes (such as lentils, chickpeas, peas, and soy) into meals, and replacing sugary drinks with unsweetened teas. Another suggestion is to prefer chocolates with a minimum of 70% cocoa content. Pires emphasizes that there is no single miracle food; the determining factor is a balanced and diverse dietary pattern.
The preparation method can also affect the amount of nutrients. Cooking food for long periods and discarding the cooking water can reduce some beneficial compounds, as can removing the skin from fruits like apples, where they are concentrated to a greater degree. The recommendation is to mix raw and cooked preparations, maintaining a diet abundant in plant-based foods.
Benefits for at-risk groups
Individuals with higher cardiovascular risk, such as those with hypertension, diabetes, high cholesterol, obesity, or a family history of heart problems, can benefit from a diet rich in flavonoids. However, it is essential to emphasize that these foods do not replace medical monitoring or prescribed drug treatments. The nutritionist warns that they integrate a set of healthy habits that aid in the prevention and control of these diseases.
To suggest a meal plan, the specialist indicates that breakfast can include apple with skin, oats, and a cup of green or black tea. For the morning snack, grapes or berries are suggested. Lunch should feature a varied salad, vegetables, and beans. In the afternoon, a small portion of chocolate with at least 70% cocoa can serve as a snack. For dinner, a colorful salad, vegetables, and a fruit as dessert are recommended.
Despite the positive results presented, there are no official guidelines established for the daily intake of flavonoids or for supplementation. The general recommendation to consume five servings of fruits and vegetables daily, regardless of type, remains valid.



