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Eating frozen meals

Try it
A frozen lunch or dinner is a great way to stick to your diet, says Shapiro. "It's forced portion control," she says.

But, she cautions, some frozen meals are full of sodium, calories, and saturated fat. "A meal should be less than 500 calories and have 5 grams or more of fiber," she recommends.

One option is Kashi's Mayan Harvest Bake, which has 8 grams of fiber, but only 340 calories and 380 milligrams of sodium—less than 20 percent of the recommended daily limit.

Next: Quaffing ice water