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User interface is very important for the app. It's better if it can have the function of self defining the font size,graphs sizeand languages so that it can work for a larger users,for example the old people and the people who can recognize English.

There might be a problem that not many people will have the incentive to use this app.Or to another words, not many people are food cravers so there may not be a large market for this app. My suggestion is to make more function which can apply to normal people's life .For example,we can expand the need of food craving to bad eating habits.Also, the app will use the users' behaviors to give a suggestion for the alternatives.