There is growing evidence that nutritional factors such as macro-and micronutrients, fruits and vegetables, dietary patterns and supplements are implicated in mood. The goal of this chapter is to review a range of traditional and innovative tools for assessing mood in relation to nutrition. We start by dening mood as a positive or negative emotional state of varying intensity that changes in response to life’s circumstances and then discuss psychometrically validated questionnaires that measure singular moods (e.g. depression) and multiple types of moods (e.g. sadness, anxiety, anger, vitality). We review questionnaires that also measure positive mood (e.g. calmness, happiness, vitality) and suggest that researchers expand their toolkit to include a broader range of well-being measures (happiness, life satisfaction and eudaemonia – positive mood associated with purpose, engagement and meaning).