Processed, high-fat foods linked with depression

November 2, 2009,
Sweetened foods could increase people’s vulnerability to depression

(PhysOrg.com) -- People who eat a diet laden with processed and high-fat foods may put themselves at greater risk of depression, according to UCL (University College London) research published today.

The research team, led by Dr Tasnime Akbaraly (UCL Epidemiology and Public Health), also found that eating a ‘whole food’ diet with plenty of fresh vegetables, fruit and fish could help prevent the onset of depressive symptoms in middle age.

The study, published in the November issue of , is the first to examine the association between overall diet and depression - previous studies have focused on the effect of individual nutrients.

Researchers from UCL studied 3,486 people with an average age of 55, and who worked in civil service departments in London. Each participant completed a questionnaire about their , and a self-report assessment for depression.

The researchers found that people with the highest intake of ‘whole food’ were less likely to report having symptoms of depression. In contrast, high consumption of processed food was associated with increased odds of depression.

These associations between diet and onset of depressive symptoms remained after the researchers controlled for other indicators of a , such as not smoking, taking physical activity and a healthy body mass.

The authors said: “Our results suggest that consuming fruits, vegetables and fish may afford protection against the onset of , whereas a diet rich in , chocolates, sweetened desserts, fried food, refined cereals and high-fat dairy products would increase people’s vulnerability.”

The researchers put forward several explanations for their findings. Firstly, the high level of in fruits and vegetables could have a protective effect, as previous studies have shown higher antioxidant levels to be associated with lower risk of depression. , which is found in large amounts in vegetables such as broccoli, cabbage and spinach, and dried legumes such as lentils and chickpeas, may have a similar protective effect.

Secondly, eating lots of fish may protect against depression because of its high levels of long-chain polyunsaturated fatty acids, which are a major component of neuron membranes in the brain.

Thirdly, it is possible that a ‘whole food’ diet protects against depression because of the combined effect of consuming nutrients from lots of different types of food, rather than the effect of one single nutrient.

The researchers said that further research is needed to explain why eating processed food is associated with higher risk of depression, but they suggested it could be because a processed food diet is associated with a higher risk of coronary heart disease and inflammation, which are known to be involved in the development of depression.

The researchers concluded: “The deleterious effect of a processed food diet on is a novel finding. Our research suggests that healthy eating policies will generate additional benefits to health and well-being, and that improving people’s should be considered as a potential target for preventing depressive disorders.”

More information: Research paper in British Journal of Psychiatry.

About the study:

The participants in this study were part of the larger Whitehall II study, which was set up by Professor Sir Michael Marmot to investigate the importance of social class, psychosocial factors and life style as determinants of disease by following a cohort of 10,308 men and women.

The study began by looking at the health of working people. It now seeks to answer questions about how previous and current circumstances affect health and quality of life in an ageing cohort. The study is currently funded by the Medical Research Council, British Heart Foundation, the National Heart Lung and Blood Institute and the National Institute of Ageing.

Provided by University College London (news : web)

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3 comments

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Sean_W
3.7 / 5 (3) Nov 02, 2009
Shouldn't it have been blindingly obvious that the causality might be reversed? Fatty foods and sugars promote pleasure and depressed people have a deficiency of neurotransmiters dealing with pleasure. Processed foods are easier to prepare so people with little energy more often resort to them. But if one has a political agenda in support of "natural" and "healthy" you needn't question something if it seems to support your beliefs about evil corporations and their desire to poison us all.
cybrbeast
5 / 5 (1) Nov 02, 2009
^Totally agree, was just about to say that. Correlation does not equal causality.
gwargh
not rated yet Nov 03, 2009
Also: processed high-fat foods are more readily available in the developed world, where depression rates have been shown to be higher to begin with.

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