Eating ultraprocessed foods is associated with an early risk of death, according to a 30-year study 鈥 but different foods have different impacts.
Processed meats and sugary foods and drinks aren鈥檛 correlated with the same risks as ultraprocessed whole grains, for example, said lead study author Dr. Mingyang Song, associate professor of clinical epidemiology and nutrition at Harvard鈥檚 TH Chan School of Public Health.
The study analyzed data from more than 100,000 health professionals in the United States with no history of cancer, cardiovascular disease or diabetes. From 1986 to 2018, the participants provided information on their health and lifestyle habits every two years.
Every four years, they completed a detailed food questionnaire.
The group eating the least ate about three servings a day on average, while the highest averaged seven servings a day, according to the study published Wednesday in The BMJ journal.
Those who ate the most had a 4% higher risk of deaths by any cause, including a 9% increased risk of neurodegenerative deaths, the data showed.
Song described the correlation as 鈥渕oderate,鈥 noting that the connection was not equally strong among all kinds of ultraprocessed foods.
鈥淭he positive association is mainly driven by a few subgroups including processed meat and sugar-sweetened or artificially sweetened beverages,鈥 he said.
Findings in this study were consistent with hundreds of others in the field, but what makes this one unique is its parsing out of different subgroups within the ultraprocessed food category, said Dr. Marion Nestle, the Paulette Goddard professor emerita of nutrition, food studies and public health at New York University.
Song wouldn鈥檛 necessarily advise a complete rejection of all ultraprocessed foods because it is a diverse category, he said.
鈥淐ereals, whole grain breads, for example, they are also considered ultraprocessed food, but they contain various beneficial nutrients like fibre, vitamins and minerals,鈥 he said. 鈥淥n the other hand, I do think people should try to avoid or limit the consumption of certain ultraprocessed foods, such as processed meat, sugar-sweetened beverages and also potentially artificially sweetened beverages.鈥
There are also more questions that need to be answered when it comes to ultraprocessed foods.
First, the recent study is strong because of the length of time covered锘, but it is an observational study. That means that while researchers can observe a correlation, they can鈥檛 say that the foods were the cause of the deaths, said Dr. Peter Wilde, emeritus fellow at Quadram Institute Bioscience in the United Kingdom.
Researchers also need to look more at the components of ultraprocessed foods that might be affecting health 鈥 whether they be food additives, emulsifiers or flavours 鈥 to advise governments and institutions on how to regulate foods, Song said.
Researchers also found that the most important factor to reducing risk of death is the quality of a person鈥檚 overall diet, Song said.
鈥淚f people maintain a generally healthy diet, I don鈥檛 think they need to be like scared or be freaked out,鈥 he said. 鈥淭he overall dietary pattern is still the predominant factor determining the health outcomes.鈥
A healthy diet is varied, with as many colourful fruits and vegetables and whole grains as possible, Wilde said.
鈥淚f you are worried about food additives, then choose foods that have low levels of additives,鈥 he said in an email. 鈥淛ust be mindful of the nutritional content of (the ultraprocessed foods) that you do choose to consume.鈥
It is also important to recognize that foods need to be eaten in balance. Fruit juice contains beneficial vitamins, minerals and antioxidants when consumed in moderation, but too much will have high levels of sugar that may override their benefits, Wilde said.
鈥淭his is not black and white,鈥 he said. 鈥淎 particular food is not either good or bad, it will contain elements of both, and the balance between the two may depend on how much you eat.鈥
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