Although the evidence is preliminary, a unique study suggests consumption of fast foods may be linked to depression. In a new review, Australian researchers studied Torres Strait Islanders, indigenous people living on islands in the area of the Torres Strait.
In a natural experiment, James Cook University researchers found that among the Islander people, the amount of fish and processed food eaten is related to depression.
A JCU research team led by Professors Zoltan Sarnyai and Robyn McDermott looked at the link between depression and diet on a Torres Strait island, where fast food is available, and on a more isolated island, which has no fast food outlets.
Dr. Maximus Berger, the lead author of the study, said the team interviewed about 100 people on both islands.
“We asked them about their diet, screened them for their levels of depression and took blood samples. As you’d expect, people on the more isolated island with no fast food outlets reported significantly higher seafood consumption and lower take-away food consumption compared with people on the other island,” he said.
The researchers identified 19 people as having moderate to severe depressive symptoms: 16 were from the island where fast food is readily available, but only three from the other island.
“People with major depressive symptoms were both younger and had higher take-away food consumption,” said Berger.
The researchers analyzed the blood samples in collaboration with researchers at the University of Adelaide and found differences between the levels of two fatty acids in people who lived on the respective islands.
“The level of the fatty acid associated with depression and found in many take-away foods was higher in people living on the island with ready access to fast food, the level of the fatty acid associated with protection against depression and found in seafood was higher on the other island,” said Berger.
Berger explains that the concentration and type of fatty acids is an important variable.
Contemporary Western diets have an abundance of the depression-linked fatty acid (n-6 PUFA) and a relative lack of the depression-fighting fatty acid (n-3 LCPUFA).
“In countries with a traditional diet, the ratio of n-6 to n-3 is 1:1, in industrialized countries it’s 20:1,” he said.
Sarnyai shares that depression affects about one in seven people at some point in their lives. However, Aboriginal and Torres Strait Islander people are disproportionately affected by psychological distress and mental ill-health compared with the general population.
“Depression is complex, it’s also linked to social and environmental factors so there will be no silver bullet cure, but our data suggests that a diet that is rich in n-3 LCPUFA as provided by seafood and low in n-6 PUFA as found in many take-away foods may be beneficial,” he said.
Sarnyai said with the currently available data it was premature to conclude that diet can have a lasting impact on depression risk but called for more effort to be put into providing access to healthy food in rural and remote communities.
“It should be a priority and may be beneficial not only to physical health but also to mental health and well-being,” he said.
Source: James Cook University