As well as enhancing overall health and physical function, the nutritional choices we make have also been linked to our psychological well-being. However, while plenty of studies have covered this connection, few have gone on to claim that trans-fat foods and other ill-advised options actively cause mood disorders such as depression.

However, according to a recent article in the online publication BMC Medicine, two medical professors in Spain argue that a lot of the research regarding this connection has been inherently flawed. Based on current reports, Professors Almudena Sanchez-Villegas and Miguel Martínez-González argue that – though it's apparent that diet and depression are linked, it is still unclear which condition precedes the other.

"It is difficult to be sure that the diet is responsible for depression – it could be that depressed people make bad food choices," the paper states.

As strange as it may sound, the academics note that many of the physiological symptoms of depression – namely swelling and changes in blood vessel structure – are also present in cardiovascular disease. Since nutrition has been clinically shown to increase the risk of heart failure, it stands to reason that it may also have a direct effect on the mental condition.

"To address these issues, we need long-term, randomized clinical studies similar to ones successfully conducted for diet and cardiovascular disease risk," the paper states.

Many people experience bouts of depression as they grow older, whether its due to their long-term dietary decisions or a natural drop in hormone levels. In addition to hormone pellet implants, the anti-aging doctors at Longevity Centres of America also provide nutritional guidance for patients who wish to look and feel great as they grow older.