September 12, 2023 – A every day smoothie has modified Lindsey Seeger's life. After doctors said her debilitating long-COVID illness could be the brand new normal, she sought out an alternate medicine expert called a naturopath. Her recommendations included a smoothie for breakfast, full of berries, bananas, cashew milk, MCT coconut oil and other ingredients.
“As a foodie, I hated the idea of ​​drinking a meal. I'd rather chew and enjoy an avocado toast. But it really helped me feel so good,” said Seegers, a nonprofit director in San Diego. Although there's no evidence that smoothies can cure Long COVID (so far as we all know, nothing does), she began feeling higher after just just a few weeks.
But latest research suggests that combining some fruits when drinking smoothies in an try to achieve health advantages can have antagonistic effects.
Focus on flavanols
The study within the journal Food & Function, looked specifically on the flavanol content of certain fruits. It seems that a banana and berry smoothie may not have as many health advantages as you're thinking that. When you combine fruits high within the enzyme that causes fruit to show brown when exposed to oxygen (like bananas) with fruits high within the helpful plant compounds called flavanols (like berries), the flavanol content drops quickly. After half-hour, the quantity of 1 flavanol dropped by 80%.
Flavanols, also referred to as flavan-3-ols, are a typical style of flavonoids—plant compounds which have been shown to advertise health. Last yr, the Academy of Nutrition and Dietetics issued its first guidelines for flavanol consumption after evaluating available research. The group found that these compounds, present in tea, apples, berries, grapes, red wine and cocoa, promote cardiometabolic health.
“If you want to increase your intake of flavanols through smoothies, avoid combining flavanol-rich ingredients like berries with fruits that easily turn brown when cut,” said study lead writer Javier Ottaviani PhD, director of the Core Laboratory of Mars Edge, a part of Mars Inc., and associate researcher within the University of California, Davis, Department of Nutrition. “This could destroy the flavanol.”
This effect isn't unique to smoothies, he said. “When you pulverize or destroy the structure of the fruit, allowing contact between the enzyme and the flavanols, it causes this loss.” Avocados, for instance, also contain the enzyme, so you possibly can expect lower flavanol levels in guacamole.
The greater picture
This may sound like a recipe for disaster, but don't hand over your regular smoothie (or guacamole) just yet.
“The last thing we want is for people to think, 'Oh, if I make a smoothie, it's not healthy,'” said Dr. Mary Ann Lila, director of the Plants for Human Health Institute at North Carolina State University. A smoothie is an especially healthy approach to get all of the bioactive compounds from the fruit, she said – so long as you drink it straight away. “If the integrity of the bioactive compounds is destroyed, you can see it. If I leave my smoothie and it turns brown, I wouldn't drink it.”
Plus, Ottaviani's advice only applies in the event you're specifically trying to boost your flavanol intake through smoothies. Most people don't need to try this. Eating a varied weight loss program—especially with a every day cup of green or black tea, which provides greater than half the advisable flavanols—can offset a banana's flavanol-killing effects. And bananas offer some impressive advantages of their very own.
“If you add a banana to your smoothie, you're getting potassium and phosphorus. Maybe not as many flavanols,” says Wintana Kiros, a clinical nutritionist within the Washington, D.C. area. “But if you're eating other foods for lunch or dinner, you're eating them throughout the day. The all-or-nothing attitude is the problem.”
The lead writer of the study agrees. “Bananas are still a great fruit,” said Ottaviani. “You can still use them in smoothies. The important thing is to eat a balanced diet.”
Just get your flavanols from some place else.
What goes improper with smoothies
While you almost certainly don’t must worry concerning the flavanol content of your smoothie, Is It's possible to drink a smoothie that backfires.
For example, an excessive amount of fruit may cause problems. “A big problem with smoothies is the total amount of calories and sugar. We definitely want you to eat fruit, but not too much of it,” says Dr. Joanne Slavin, a professor of food science and nutrition on the University of Minnesota. “When most people start blending fruit, it becomes a lot of calories.”
A related mistake: omitting vital nutrients. “Especially for people on a calorie-restricted diet, a smoothie needs to contain protein so it can replace a meal,” said Slavin. She has researched the consequences of protein in smoothies. Along with the fiber in fruit, protein can enable you feel fuller longer.
Store-bought smoothies may pose an issue. For one thing, you've gotten no control over how much sugar is added. Plus, “nutrients and bioactive compounds are not compromised in home processing,” Lila said. “However, they can be compromised in commercial processing when heat is used or additives are added.”
Secrets of a nutritious – and delicious – smoothie
So you're able to get out the blender. What should go in? Aim for a mixture of nutrients. “I recommend a cup of berries, a cup of spinach and Greek yogurt or protein powder,” Kiros said. “You need a source of fiber, a source of fat and a source of protein.”
Don't be afraid to get a bit creative either. Here are some ideas:
- Fruit after all. Frozen fruit works particularly well here. It helps thicken the smoothie and might contain more bioactive compounds than fresh fruit since it is frozen at the height of freshness. Lila opts for blueberries in her own morning smoothie. Her research has found that eating them every day can reverse cognitive decline in older people. But don't limit yourself to the same old bananas and berries – try tropical pineapple and mango, or try peach, melon or kiwi.
- Surprise: Vegetables. You get more bioactive compounds with less sugar whenever you add vegetables to your smoothie. Avocado, for instance, adds a creamy texture, mild flavor, and healthy fat. Lila recommends mixing kale with yogurt or a splash of juice before adding the remainder of the ingredients—the plant-based flavor blends in perfectly. Kiros has spinach. And Seegers, the foodie who hated her breakfast, adds frozen carrots.
- Protein, definitely: If you're uninterested in the same old yogurt and milk, try adding kefir, cottage cheese or ricotta, tofu, peanut powder, your favorite nut butter, edamame, canned white beans, or seeds like chia, flax, and pumpkin seeds.
- Delicious extras: “To be healthy, it has to be something you want to eat,” Lila said. “I believe in making things tasty.” That could be a drizzle of honey or maple syrup, spices like cinnamon, nutmeg and cardamom, cocoa powder or vanilla extract. Seegers is a giant fan of frozen cubes of crushed ginger.
In fact, Seegers has turn out to be an enormous fan of smoothies on the whole. “I can't give up smoothies,” she said. “They're my thing now, they're my life.”