Are Calorie Deficits + Exercise 100 % Guaranteed?

Hello Everyone,

Lot's of people and People Online say a Calorie Deficit it not the way to go simply because when counting calories and burning calories you don't know the actual amount you are burning and that metabolism changes a lot so your caloric needs vary. I am hoping to lose 1kg Per week. I have calculated my deficit and have to burn around 1072 calories per day (Deficit ) and consume around 1,500-800 calories per day.

I don't mean to offend anyway I am just curious and confused to know if this is prominently accurate and works for everyone?

Thank you

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