They're accurate as long as all your information is correct which is where it can get tricky. Then you have the new feature that syncs your calorie range with your calories burned that day and accounts for your activity level and that is a whole other ball game! I'm still trying to hammer it out.
But let's keep it less complicated and use the old tracker as an example. I find it's accurate as long as you are what's considered "sedentary" outside exercise (and if you are not, you account for extra steps and activity in your fitness tracker... reasonably). You accurately calculate how many calories you burn through exercise and have your weekly burn entered into your fitness setup. You of course, measure/weigh your food and not just eyeball it; you are honest about how many calories you consume and finally you have a realistic goal date.
I think where you eat in your range can depend on how much activity you do outside of exercise. Which can be difficult to calculate unless you can wear a HRM.
Spark loves to give me the 1200-1550 cal range with the old tracker to lose 1 lb per week. I find I tend to lose 1-1.5 lbs/week when I stick to the upper range so I'm giving the new tracker a whirl right now and put myself as "lightly active" rather than sedentary. Lately, I've been averaging 1600 cals/day and waiting to see where that takes me on the scale.
Take your focus off the Marshmallow. www.leangains.com/2010/01/marshmallo
"Toning" is marketing muscles to women who are afraid if they pick up a barbell, they'll leave the gym looking like She-Hulk. If you don't want to get bulky, lift heavy!
I can bench Nicole Richie, eat more than she does in a day before noon, I have a good 20 lbs on her but could still wear her pants.
All that matters is that you be the healthiest you, you ca
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