I once received a lot of blowback for an Upshot article in which I showed (with evidence) that exercise is not the key to weight loss. Diet is. Many, many readers cannot wrap their head around the notion that adding physical activity, and therefore burning more calories, doesn’t necessarily translate into results on the scale.
Well, here we go again because some of those folks also believe that fitness devices — Fitbit, Vivosmart, Apple Watch — must be helpful in losing weight. Unfortunately, evidence doesn’t support this belief either.
For some time, people have been trying to prove devices like these succeed in promoting weight loss. In 2011, a study compared four groups getting a mixture of behavioral weight loss programs and use of an armband that measured activity and energy expenditure. All the intervention groups lost weight.