Don't skip any meals or snacks, says Sass. "Try not to let more than five hours go by without eating. Waiting too long can zap energy, and can lead to overeating later. Eat a (healthy) snack between lunch and dinner, maybe right before leaving work, so you will be less likely to grab snack foods once you get home."

Include a total of 30 minutes of activity every day. "It doesn't have to be all at once," Reichenberger tells WebMD. If it takes 10 minutes to walk from the bus stop, get off at the next furthest stop so you get a few more minutes walking. And walk it briskly -- you can lose some weight, improve your cardiovascular system, and sleep better.

Drink fewer sodas and other sweetened drinks, like iced tea. A big bottle of a juice-based drink can contain 300 calories -- and those calories add up. Drink water instead. Or mix juice and water, so you're not drinking something so heavily loaded with sugar.

Aim to eat five servings of fruits and vegetables every day. Buy pre-cut fruits and vegetables, so you can grab them when you're hungry.

Keep frozen veggies in the fridge. They are easy, quick, and rich in nutrients. Take them to work for a quick lunch you can heat in the microwave. Season with black pepper, herbs, lemon juice, or a red wine-and-balsamic vinegar dressing.

Bring snacks to work -- such as pretzels, fruit, and yogurt -- so you won't find yourself at the vending machine every afternoon.

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