Ultra-Processed Foods Linked to a Higher Risk of Insomnia, a Large Review Finds

What people eat may have more to do with how well they sleep than many realize. A large research review has drawn a connection between diets heavy in ultra processed foods and a higher risk of insomnia, adding to a growing body of work on the links between nutrition and rest.

What the review found

The analysis, published in the journal Nutrients in 2024, pooled data from seven studies covering 107,194 participants. It reported that higher intake of ultra processed foods was associated with an increased risk of insomnia, with a pooled odds ratio of 1.53 and a 95 percent confidence interval of 1.20 to 1.95.

According to the researchers, the association was significant across the studies they examined, and it appeared particularly notable among adolescents. The finding points to a possible relationship between modern eating patterns and difficulties with sleep.

What counts as ultra-processed

The review relied on the NOVA classification, a system that groups foods according to the level and purpose of industrial processing rather than their nutritional content. Ultra processed foods sit at the far end of that scale, having undergone extensive industrial transformation.

These products are typically high in fat, sodium and sugar, and often contain additives such as emulsifiers and preservatives. They tend to be convenient and widely available, which has helped them take up a growing share of diets in many countries around the world.

Sleep quality, not just insomnia

The concern is not limited to insomnia alone. An earlier meta analysis from 2022 that reviewed 15 cross sectional studies found consistent associations between high consumption of ultra processed foods and reduced sleep quality, suggesting the effect may be fairly broad.

Possible explanations

Researchers have proposed several mechanisms that could help explain the link. Ultra processed foods have been associated with oxidative stress and inflammation, and their high content of fat, sodium and sugar may play a role in how the body regulates sleep and rest.

An important caveat

The authors of the review were careful to stress the limits of the evidence. Because the studies were observational in nature, they can only suggest potential associations and cannot establish that ultra processed foods directly cause sleep problems in people.

Using a standard method for grading evidence, the certainty of the findings was rated as low. This reflected the reliance on cross sectional study designs and a notable degree of inconsistency between the individual studies included in the analysis.

Why it still matters

Even with those caveats, the findings are seen as worth attention. Both poor sleep and diets rich in ultra processed foods are common in many societies, so any potential link between the two is relevant to a very large number of people.

A focus on older adults

Research has also begun to look at specific groups. A 2026 study examined the association between ultra processed food intake and sleep quality among community dwelling older adults, a population in which sleep problems are especially common and often overlooked.

What people can take from it

For now, experts frame the evidence as a reason to pay attention to overall dietary patterns rather than to draw firm conclusions. The research adds to wider discussions about the place of ultra processed foods in everyday diets and their possible effects on health.

Conclusion

Taken together, the studies point to a consistent association between heavy consumption of ultra processed foods and poorer sleep, from insomnia to reduced sleep quality. While the evidence stops short of proving cause, it adds another dimension to how diet and rest may be connected.