What Happens to Your Body When You Eat Blueberries Every Day, According to Dietitians

Blueberries are generally available year-round because they are so popular in the United States. We add them to everything from smoothies and oatmeal to muffins and yogurt parfaits. Beyond their sweet, addictive flavor and freezer appeal, blueberries have also built a reputation as one of the most accessible superfoods.

But what actually happens if you eat blueberries every day? (We’re guessing some of you already do this!) We asked registered dietitians which aspects of your health benefit most when you regularly include blueberries in your diet. Here’s what blueberries actually contain and what your body may feel on a molecular level if you make them a daily habit.

Blueberry Nutrition

Blueberries are so convenient that many people already eat them quite regularly. One study found that about 61% of consumers report eating blueberries every week. They’re nutrient-dense, easy to grab and go, and contain plant compounds you won’t get from a multivitamin.

“Blueberries are packed with vitamins and minerals that contribute to good health and have earned their title as a ‘superfruit,'” says Melanie Marcus, MA, RD, registered dietitian, chef and communications manager for Dole Food Company. “They are rich in anthocyanins, a natural compound that helps reduce the risk of cardiovascular disease. Anthocyanins also help protect the retina from oxidative stress and have been shown to support overall eye health.”

Michelle Routhenstein, RD, CDCES, CDN, preventive cardiology dietitian and certified diabetes educator, says the benefits of blueberries extend beyond heart and eye health. She saw the fruits linked to a lower risk of type 2 diabetes, as well as improvements in vascular function.

Even small amounts can have an impact: “Studies show that just 1/3 cup per day can help lower LDL cholesterol and triglycerides, while increasing HDL in people with diabetes,” says Routhenstein. “They may also support brain health, insulin sensitivity and overall metabolic function.”

Ultimately, blueberries are a healthy, relatively inexpensive option that can easily fit into a balanced diet, says Dawn Menning, RD, CDCES, registered dietitian and certified diabetes care and education specialist at Nutu. She describes them as “a green light food” because they offer high nutritional value and have a relatively modest effect on blood sugar levels,” noting that even a full cup is a convenient option to include regularly in your diet.

Here’s a look at what’s in one serving or 140 grams (g) of raw blueberries, according to USDA data:

Macronutrients
Calories: 89.6 calories
Protein: 0.98g
Carbohydrates: 20.4g
Fat: 0.43g

Micronutrients
Calcium: 17.8 milligrams (mg)
Magnesium: 8.86mg
Potassium: 120mg
Vitamin C: 11.3 mg
Sodium: 5.44 mg
Small amounts of zinc, biotin and iron

What happens when you eat blueberries every day?

If you eat blueberries every now and then every day, you may start to notice changes in your body within the first week. These benefits tend to become more pronounced the longer you maintain the habit. Here’s what’s happening behind the scenes.

After a week

At this point, your body begins to adapt to the added fiber and constant intake of other nutrients. “During the first week, the body benefits from a higher intake of antioxidants, which helps reduce oxidative stress and support metabolic health,” says Menning. This may look like more regular digestion or more stable energy levels.

Unfortunately, fiber that improves digestion can also cause temporary discomfort. “For most people, ½ to 1 cup of blueberries per day is a comfortable amount and often used in health studies,” says Routhenstein. “If you suddenly eat a lot more, like several cups a day, the excess fiber can cause bloating, gas, or loose stools, especially if your body isn’t used to high-fiber foods.” To avoid this feeling, she recommends starting with a small amount, like ¼ to ½ cup, and slowly increasing over 1 to 2 weeks to help your body adapt better.

After a month

After a few weeks, the changes extend beyond digestion and affect the functioning of your body more broadly. “With continued daily intake for a month or more, polyphenols (from blueberries) have been shown to improve insulin sensitivity and may even support brain health by improving blood flow to the brain and protecting neurons from oxidative stress,” says Routhenstein. Even if you don’t feel these molecular changes, you may notice things like better concentration and less fatigue.

Long-term intake also promotes healthier blood vessel function. “After a few weeks, research suggests that blood vessels might start to work more efficiently and gut bacteria would start to adapt to the fiber and polyphenols in the fruit,” says Marcus. She cites a well-known study published in the American Journal of Clinical Nutrition which followed adults with metabolic syndrome who consumed the equivalent of half a cup or a cup of blueberries per day for six months.

“Over time, the group consuming about one cup per day showed improved endothelial function, meaning their blood vessels were more able to relax and dilate,” she explains. “This is a sign that the arteries may become more responsive and flexible with consistent blueberry consumption.” Simply put, your circulation improves. This might make physical activity a little easier or help your body regulate temperature more effectively.

Although blueberries are not a magic bullet for perfect health, when combined with a balanced diet, they can help you improve your metabolic and heart health significantly. Not bad for something you can eat by the handful.