Hi JeanB, I’m also using the same app and you are right it does not save your day if you are doing 800 calories and gives you a “nanny state” warning. I have found it doesn’t matter that it won’t save the day as you can always look back to previous days.
I’m also using Runkeeper to track my walks and runs, the app links to My Fitness Pal and shows calories using during excercise.
Good luck with BSD