Why fitness apps use calories to help you lose weight

By

There's no barcode on this doughnut so it doesn't count
There's no barcode on this doughnut so it doesn't count
Photo: Graham Bower/Cult of Mac

Most fitness apps seem obsessed with calories. Go for a run, and your Apple Watch tells you how many calories you burned. Scan a barcode and MyFitnessPal tells you how many calories are in the food you are about to eat.

So what exactly are calories, and does counting them really help you achieve your fitness goals?

Why Apple’s Active Calories don’t add up (and how you can change that)

By

In Apple's fitness apps, active calories are not the same as Move ring calories.
In Apple's fitness apps, active calories are not the same as Move ring calories.
Photo: Graham Bower/Cult of Mac

Have you ever noticed that some of your workout data is missing from the Health app on your iPhone?

Apple’s Health app is designed to provide a central hub for all your fitness apps to save and share their data. You might assume this means all your Active Calories are added together, regardless of which app you use to log them. But the truth is not that simple — although you can tweak some hidden settings to customize what you see.