How many times a day and how many unique food items does one need to eat to continually remain so hopelessly unfamiliar with their caloric intake that they need an app to track it?
What role can AI possibly have in this, when all you need to do is either turn around the packaging or do a web search for the dish you cook to get a number?
By enabling you to think in terms of what you ate, rather than numbers. If you eat a varied but regular diet, this enables you to stop having to track. You'll just know your approximate caloric budget and intake for the day, and what that means in terms of food items.
When you have to take ownership of your diet (and thus your weight), that means a permanent lifestyle change. Tracking is simply not sustainable indefinitely, so you must establish better consumption habits while you do so, that will stick past the tracking. Tracking and getting to know what you eat, rather than tracking your calories, is what enables you to form such a habit and knowledge base.
Eating random stuff and thus having to use AI due to a lack of easily accessible and personally learnable nutrition information makes a total mockery of this process, and runs pretty much antithetical to it.
What role can AI possibly have in this, when all you need to do is either turn around the packaging or do a web search for the dish you cook to get a number?