What if a person has a slower (or faster) metabolism, and needs a deficit of, say, 4,000 kcal to lose a pound of fat? Weight loss would be slower, but the correlation would be the same.Ĭlick image for interactive version More Details Assuming 3,500 kcal/lb., my weight should have been 193.7 lbs.
![calorie tracker apple watch calorie tracker apple watch](https://www.standalonesmartwatch.com/wp-content/uploads/2022/07/HW8-Max-SmartWatch-Apple-Watch-Series-8-Clone-300x159.png)
After 79 days, the calorie deficit using the EE numbers from the Apple Watch was 87,157. The correlation between the predicted calorie deficit (according to the Apple Watch) and my actual weight is very good. The results are quite clear in the graph below. All of the data for this experiment can be found in this Google spreadsheet, including every food I ate and the portion size (there are approximately 1,300 entries, an average of 15.5 per day).I also have no idea if iOS or watchOS uses body fat measurements for its EE calculations. I know the scale is consistent measuring weight (I tested it using objects of known weight), but I have no idea how accurate the body fat measurements are. I weighed myself with a digital scale that also estimates body fat percentage.
#Calorie tracker apple watch series
I wore my Apple Watch Series 5 as much as I could, approximately 22 hours a day.I wrote my own app because I needed quality-controlled calorie counts for the foods I was eating, and very fast entry of foods, which is a necessity when trying to track every calorie that one consumes (I tracked amounts as small as a few jellybeans). For 84 days, I tracked all the calorie-containing food I ate, and some of my diet soda consumption, using a food tracking app and an Alexa skill that I wrote for this experiment.That is, they don’t answer the question “Can I use the calorie estimates from the Apple Watch to lose weight?” I think the answer, for many people, is “yes”.
![calorie tracker apple watch calorie tracker apple watch](https://www.iphonelife.com/sites/iphonelife.com/files/styles/promo_in_content_breakpoints_theme_newmango_mobile_2x/public/accuratecalories.jpg)
There have, of course, been a number of studies attempting to quantify the accuracy of smartwatch calorie tracking, but as far as I can tell they were mostly short-term (a few hours), and didn’t measure the correlation between EE estimates and weight. In the fall of 2019, I conducted a 12-week experiment to determine how accurately the Apple Watch calculates “energy expended” (EE), both while resting and while exercising. Tracking calories while swimming with the Apple Watch