It turns out a lot of what we know in terms of metabolism and activity is completely wrong and counter intuitive, and apps like MyFitnessPal do not reflect the reality of how out bodies expend calories.
It seems to be the case that the body will burn a fixed amount of calories no matter how active you are. When you walk or run consistently, these aren't extra calories burned, your body adjusts and moves calories from other metabolic activities to make up for the physical expenditure.
What this means is that weight loss is mostly achieved through diet. This doesn't mean exercise is worthless, it's actually hugely important for health and making sure your metabolism isn't too active elsewhere. There is still much to learn about how and why this is, but we need to unlearn some of the accepted concepts, like TDEE + exercise = total calories burned, because it's now proven to be completely false.
EDIT: I first learned about this via a podcast where the author came on. I recommend at least giving it a listen if you don't want to commit to the book: https://pca.st/episode/d979115e-60e3-42cc-a4da-385498050d5b
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from loseit - Lose the Fat https://ift.tt/35beHZ9
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