5 Fruits You Need to Eat Every Day to Not Gain Weight

We all know more fruits and veggies in our diets will help our health, but these nutrient powerhouses pack a special punch if you're trying to shed a few pounds.

bowl of blueberries and scattered blueberries on a dark background
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In a BMJ study of more than 100,000 men and women, researchers discovered that subclasses of powerful antioxidants called flavonoids—namely flavonols, flavan-3-ols, anthocyanins, and flavonoid polymers—found in select fruits and vegetables may prevent weight gain. The healthiest fruits with the greatest effect on weight maintenance were chock full of flavonoids called anthocyanins, and blueberries top this list.

About one-quarter cup of blueberries contains 10 milligrams of anthocyanins, and each 10 mg increase is linked with a quarter-pound less weight gain over four years, the BMJ study found. This may seem insignificant, but it can add up with time, the study authors point out. Exactly how flavonoids deter weight gain is not fully understood but eating foods rich in flavonoids—namely produce—may allow us to feel full sooner, and avoid other less-healthy foods that may lead to weight gain.

“I am a blueberry fan for many reasons,” says Keri Peterson, MD, an internist at Lenox Hill Hospital in New York City. Antioxidant power aside, blueberries are also rich in fiber which keeps us feeling full longer, she says. “They are among the healthiest fruits to eat.” Berries happen to be among the most-filling fruits. Aim for a cup of blueberries a day as part of an overall healthful diet that is rich in lean protein, complex carbohydrates, healthy fats like olive oil, fruits, and vegetables, she says.

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red apples on weathered wood table
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It’s great if an apple a day can keep the doctor away, but it’s an added bonus if it also helps keep you trim! Apples are rich in flavonoid polymers and are also packed with fiber, making them one of the healthiest fruits for weight loss. One medium-sized apple is considered one serving. Eat them with the skin on (i.e. unpeeled) to get more fiber, antioxidants, and better control over your blood sugar, says Sharad Paul, MD, the Auckland, New Zealand-based author of The Genetics of Health: Understand Your Genes for Better Health. Preventing blood sugar spikes and valleys will help banish food cravings and eating binges, not to mention help protect against diabetes.

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pears glistening with water
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Pears may also prevent weight gain, according to the BMJ study, and this is largely due to flavonoid polymers: Every extra 138 mg of flavonoid polymers resulted in less weight gain over the four-year study period. “Fruits that are rich in flavonoid antioxidants and high in fiber are great choices,” Dr. Peterson says. “Fiber fills you up and creates satiety, so pears and apples give you a lot of bang for your buck.” Make sure to eat the skin too for maximum benefits, adds Dr. Paul.

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strawberries on a deep blue dish
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Strawberries help maintain weight for the same reason as blueberries: They’re rich in anthocyanins. Start incorporating one cup of strawberries a day into your diet by trying them with breakfast over low-fat yogurt or steel-cut oatmeal, as a mid-afternoon snack, or as a dessert after dinner, Peterson says. “The concern has been that eating sweet fruits may cause weight gain due to fructose content. However, certain fruits like green apples, pears and berries like raspberries, strawberries and blueberries are among the best fruits to eat as part of a weight management plan not only because they are less sweet, but due to their high flavonoid content.”

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variety of peppers


First, yes: Peppers are in fact a fruit. Ranking up there with the healthiest fruits, they can also help put the brakes on weight gain when eaten daily, according to the research. In fact, peppers may even encourage weight loss. Capsaicin, the component that gives chili peppers that kick, seems to encourage white fat cells to convert into energy-burning brown fat, in one study done on rats.

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  • BMJ: "Dietary flavonoid intake and weight maintenance," 2016
  • Keri Peterson, MD, an internist at Lenox Hill Hospital, New York City
  • SharAd Paul, MD, Auckland, New Zealand
  • Biophysical Society: "What's next in diets: Chili Peppers?," 2015
Medically reviewed by Elisabetta Politi, CDE, MPH, RD, on October 13, 2019

Denise Mann, MS
Denise Mann is a freelance health writer whose articles regularly appear in WebMD, HealthDay, and other consumer health portals. She has received numerous awards, including the Arthritis Foundation's Northeast Region Prize for Online Journalism; the Excellence in Women's Health Research Journalism Award; the Journalistic Achievement Award from the American Society for Aesthetic Plastic Surgery; National Newsmaker of the Year by the Community Anti-Drug Coalitions of America; the Gold Award for Best Service Journalism from the Magazine Association of the Southeast; a Bronze Award from The American Society of Healthcare Publication Editors (for a cover story she wrote in Plastic Surgery Practice magazine); and an honorable mention in the International Osteoporosis Foundation Journalism Awards. She was part of the writing team awarded a 2008 Sigma Delta Chi award for her part in a WebMD series on autism. Her first foray into health reporting was with the Medical Tribune News Service, where her articles appeared regularly in such newspapers as the Detroit Free Press, Chicago Sun-Times, Dallas Morning News, and Los Angeles Daily News. Mann received a graduate degree from the Medill School of Journalism at Northwestern University in Evanston, Ill., and her undergraduate degree from Lehigh University in Bethlehem, Pa. She lives in New York with her husband David; sons Teddy and Evan; and their miniature schnauzer, Perri Winkle Blu.
Miranda Manier
Miranda is the Associate Editor for TheHealthy.com and The Healthy section of Reader's Digest magazine. Previously, Miranda was a producer at WNIT, the PBS affiliate in South Bend, Indiana; and the producer in residence for Minneapolis TV news KARE 11, where she won an Upper Midwest Regional Emmy Award for producing gavel-to-gavel coverage of the Derek Chauvin trial. Miranda also interned at Chicago’s PBS station, WTTW, and worked as the managing editor at the Columbia Chronicle at Columbia College. Outside of work, Miranda enjoys acting, board games, and trying her hand at a good vegan dessert recipe. She also loves talking about TV—so tell her what you’re watching!