Less ultra-processed food tied to fewer depression symptoms after 70, study finds

Older adults who ate fewer ultra-processed foods and more anti-inflammatory foods had lower rates of depressive symptoms, and the link held whatever their genetic risk of depression, according to a study by researchers at Deakin University in Australia published in the journal Molecular Psychiatry and reported on October 21, 2026. The team analysed more than 7,200 adults aged 70 and older. Those who ate four or more servings of ultra-processed food a day had a 12% higher rate of depressive symptoms than those who ate fewer, while those whose diets were more anti-inflammatory had a 7% lower rate than those with more pro-inflammatory diets.

Depression in later life is common and often missed. It can be mistaken for the ordinary slowing-down of age, and older people are less likely to seek help. Anything that might lower the risk through everyday choices, such as what people eat, is therefore of wide interest to families and health workers.

The finding about genes is the most useful part for readers. Many people assume that if depression runs in their family, there is little they can do about it. In this study, the link between a healthier diet and fewer depressive symptoms appeared just as strongly in people with a higher genetic risk as in those with a lower one. If that holds up in further research, it suggests that diet is something worth paying attention to whatever a person's family history.

It helps to be clear about the terms. Ultra-processed foods are industrially made products that typically contain ingredients not used in home cooking, such as flavour enhancers, emulsifiers and certain additives; packaged snacks, sugary drinks, instant noodles and many ready meals fall into this group. An anti-inflammatory diet leans towards vegetables, fruit, whole grains, pulses, nuts and healthy oils, and away from refined and heavily processed foods. Researchers think that long-term, low-level inflammation in the body may play a part in depression, which is one reason the study looked at both diet and inflammation.

Traditional Indian home cooking, built around dals, vegetables, whole grains and spices, has much in common with what researchers describe as anti-inflammatory eating, while packaged snacks and ready-to-eat foods are a growing part of diets in Indian cities. The study did not look at Indian diets, and it does not show that any particular food treats depression. But it adds to a large body of research suggesting that eating patterns based on minimally processed foods are associated with better health in older age.

Short-term: The findings give doctors and families another reason to discuss diet with older relatives, while making clear that food is not a substitute for medical care for anyone experiencing depression.

Long-term: If confirmed by trials, the results could support public health advice that includes mental health among the benefits of limiting ultra-processed foods in later life.

Who is affected: Older adults and their families; doctors, dietitians and mental health workers who care for older people; and policymakers working on healthy ageing.

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