I think this is a really clever idea and would be massively successful IF it worked well. My questions is: How accurate could this ever possibly be? The ranges

I think this is a really clever idea and would be massively successful IF it worked well. My questions is: How accurate could this ever possibly be? The ranges in the screenshot are far too wide to be very helpful (150-614 calories). For the people I know who count calories, that's not going to cut it. Still, love the idea.