According to studies - Foods and beverages affect mood and behavior, even in the short term. Research studies that investigate the best overall dietary patterns for good mental health invariably arrive at a conclusion: the foods and beverages that support optimal physical health are the same ones that support optimal mental health.

Ref - https://www.dmu.edu/dose/2016/04/the-food-mood-connection/ 

Dark chocolate made with a high percentage of unsweetened chocolate (+70%) contains sufficient theobromine to relax your big, broad muscles which also constrain your blood vessels. It also boosts your serotonin (the feel good hormone). If you blood pressure drops and you feel relaxed and your mood is elevated, the residual sugar in the chocolate will also give you a bit of an energy spike to incrementally enhance your overall feeling a well being.

According to the Harvard University "The research regarding dietary factors and depression is still inconclusive," says Patricia Chocano-Bedoya, a visiting scientist in the Department of Nutrition at the Harvard T.H. Chan School of Public Health. But there have been hints that food may play a role in depression!!! further studies are needed!
https://www.health.harvard.edu/mind-and-mood/food-and-mood-is-there-a-connection

Many patients of mine reach for sugary or simple carbs under stressful conditions or to satiate their soul. Rare that one would reach for beans or steak for filling up one's emotional void. I have also seen patients who tell me they look for textural foods to eat, perhaps crunchy items, to appease mood issues. Best course of action is to go for a walk!!

At home, we all live by the same great guidelines: healthy variety in reasonable quantity.

Treat day is Sunday afternoon + 1 other day: an ice cream cone, cookie, a piece of cake.

Always 3 good meals plus healthy snacks (apples, cheese stick, peanut butter +)

 It has been viewed through research and evaluated that there is  potential health benefits of consuming chocolate, where as  no complete view   to confirm about  effect on  medical  for health matter and  chocolate  is high  in coco butter and fat removed during chocolate refining and also  added proportions during manufacturing adding other fats, sugar  and powdered milk as well which has  different  effects   on health   for  eating Chocolate and  consumption of large quantities of  energy-rich food, such as chocolate has also effect. 

Chocolate is  comfort food  in times of stress and a mood-enhancer and romance-inducer in more positive  ways in which  good chocolate,  dark chocolate, with a cocoa percentage  is good for us  and experts have  found that chocolate is good and suggested that it may be beneficial  for   heath.