Data analysis of a food item based on one or more digital images of the food item is disclosed. In one embodiment, the method comprises displaying, on a display unit of the smart device, first and second digital images of a meal, where the first digital image is captured before the second digital image. The method also comprises determining a volume of each food item in the first digital image and a volume of each food item in the second digital image by analyzing the first digital image and the second digital image using a digital image processing technique. The method further comprises generating, on the display unit, an amount of intake for the meal based on a difference between the volume of each food item in the first digital image and the volume of each food item in the second digital image.