Just be careful using the AW (or any fitness tracker) to count calories.
Apple Watch overestimates calories by anywhere from 10-25%, with many factors determining that.
You can use MyFitnessPal to track intake, then it’ll take some use of the Apple Watch to find out how much it is off for their body.
One of my buddies AWs is off by 10%. Mine is off my 20%. It depends on so many things.