Android phones for maintaining a healthy report

Samsung Health, Google Fit... there are any number of health-focused apps out there. Counting calories, however, requires a user to input all food, beverages, snacks and treats into the app. How many people will take the time to do that? An alternative is if an app allows a user to snap a photo of their food prior to eating: and through machine learning the app will try to identify the food; analyze the amount; calculate the calories and add them in. That would be far from accurate, though, and would require the app to know virtually everything about every food a person could possibly consume. How many developers will take time to do that?