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Your XFINITY Connect session has timed out due to inactivity. Click here to go back close The 25 Best Diet Tricks of All Time

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Do the Math

"Add a zero to your weight and use that to figure how many calories you should have if you're moderately active. If you weigh 140pounds, aim to eat 1,400 calories."

—Jackie Newgent, RD, author of "1,000 Low-Calorie Recipes"

(Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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