A very interesting study from the University College London in the UK followed 3,486 people for five years. At the end of five years, they matched their depression to their diet.

They found that the most depressed individuals consumed “processed food” (heavily loaded by sweetened desserts, fried food, processed meat, refined grains and high-fat dairy products). In contrast, the least depressed people consumed a diet of “whole foods” (heavily loaded by vegetables, fruits and fish).

Depression is a surprisingly common symptom. Before you turn to pharmaceutical antidepressants, start with changing your foods. If you eat a healthy diet your depression may subside. I strongly encourage you to take a good hard look at your diet – the best and most effective way is to write a food/mood diary and begin to notice any trends that appear. How did you feel an hour after you ate that coffee and banana bread this morning?

I always see improvements in mood when the processed nutrient-poor food is removed and replaced with whole, organic and nutrient rich foods.

Dietary pattern and depressive symptoms in middle age

BACKGROUND: Studies of diet and depression have focused primarily on individual nutrients. AIMS: To examine the association between dietary patterns and depression using an overall diet approach. METHOD: Analyses were carried on data from 3486 participants (26.2% women, mean age 55.6 years) from the Whitehall II prospective cohort, in which two dietary patterns were identified: ‘whole food’ (heavily loaded by vegetables, fruits and fish) and ‘processed food’ (heavily loaded by sweetened desserts, fried food, processed meat, refined grains and high-fat dairy products). Self-reported depression was assessed 5 years later using the Center for Epidemiologic Studies – Depression (CES-D) scale. RESULTS: After adjusting for potential confounders, participants in the highest tertile of the whole food pattern had lower odds of CES-D depression (OR = 0.74, 95% CI 0.56-0.99) than those in the lowest tertile. In contrast, high consumption of processed food was associated with an increased odds of CES-D depression (OR = 1.58, 95% CI 1.11-2.23). CONCLUSIONS: In middle-aged participants, a processed food dietary pattern is a risk factor for CES-D depression 5 years later, whereas a whole food pattern is protective.

Br J Psychiatry. 2009 Nov;195(5):408-13.

PMID: 19880930