A study published in “Frontiers in Psychology” suggests eating raw vegetable rather than cooked, canned or processed, is linked to better mental health. This article, from April, 2018 is a worthwhile read.
“If our patterns are confirmed in intervention studies, it would suggest that heath policies could focus on promoting the consumption of raw and unprocessed produce for optimal well-being,”
“Raw fruits and vegetables may provide greater levels of micronutrients than processed fruits and vegetables, which could explain their stronger association with improved mental well-being,” they wrote. For compounds like vitamin C and carotenoids that have been linked to mental health, “cooking and canning would most likely lead to a degradation in nutrients, thereby limiting their beneficial impact on mental health.”Health.com