1. A system for measuring food intake of a user, the system comprising: a mobile device having a built-in camera, the mobile device being configured to capture a first image including a food item to be eaten by the user; and a remote server in communication with the mobile device, the remote server being configured to: receive the first image; calibrate a size of the food item in the first image; segment the first image into one or more segmented regions where the food item is located; identify a food type of the food item in one or more of the segmented regions; and estimate a volume of the food item using only the one or more segmented regions of the first image.