Changing Your Diet Can Change How You Feel. Change your diet, change your mood? Science says the answer is yes. Food isn't just fuel for the body; it feeds the mind and changes our moods. Food scientists are still exploring the big picture regarding food and mood, but it's clear that certain foods have a feel-good factor. Try these five mood-boosting snacks.No. 1 - Bananas Bananas offer serious mood-lifting power, with their combination of vitamins B6, A and C; fiber; tryptophan; potassium; phosphorous; iron; protein; and healthy carbohydrates. When you eat a banana, you'll get a quick boost from the fructose as well as sustaining energy from the fiber, which helps prevent a blood sugar spike and ensuing drop in energy and mood. Carbohydrates aid in the absorption of tryptophan in the brain, and vitamin B6 helps convert the tryptophan into mood-lifting serotonin. Bananas are also a great source of potassium. While potassium isn't directly related to mood, it's needed to regulate fluid levels and keep muscles working properly, which is important for feeling energized, a key factor for a sunny outlook.