045 - Fitness Trackers and Baby Powder | The Body of Evidence

045 - Fitness Trackers and Baby Powder

Fitness trackers lined up


Don't mind Chris' newfound psychic powers; do fitness trackers like Fitbits actually work? They monitor our heart beats, they count our steps and calories burnt, but do they do it accurately? And can they help us lose weight? Also: you'll never believe what actually motivates people to exercise; early detection is not as easy as it sounds; does Johnson & Johnson's baby powder cause cancer and should you even use baby powder in the first place; and how to judge the merits of a scientific paper when you're not a scientist.


Vox pop by Ada McVean of the McGill Office for Science and Society.


Jingle by Jillian Kate.


Additional music by Seth Donnelly and Kevin MacLeod.


Theme music: "Troll of the Mountain Swing" by the Underscore Orkestra.


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Sales of fitness trackers:



HR accuracy of fitness trackers:



Energy expenditure accuracy of fitness trackers:




Fitness trackers for weight loss (The IDEA trial):



Fitness trackers and lack of motivation



Fitness trackers and cash incentives:



Fitness trackers and hard outcomes:



Apple Watch accuracy: