Most people gain a pound or two a year, which can really add up. A svelte 130-pound 18-year-old could turn into an overweight 170-pound 38-year-old etc...

Here are ve ways to cut 100 calories out of your diet each day. Doing any one of them could keep you from gaining that typical pound or two a year. The tips are from from Kim Gorman, a registered dietitian with the University of Colorado's Center for Human Nutrition.

1. Old: whole milk New: 1 percent milk Let's say you have milk with your cereal and then a glass of milk some other time during the day. Drinking 1 percent milk instead of whole milk saves you 100 calories.

2. Old: whole bagel New: half a bagel Give the other half of your bagel to a friend, and you'll save 100 calories. Depending on the size of the bagel, you could save even more.

3. Old: chocolate ice cream New: chocolate yogurt or a Popsicle Swap out the ice cream for the yogurt, and you're consuming 100 fewer calories. You'll save nearly that much if you have a Popsicle instead of the ice cream.

4. Old: latte made with whole milk New: latte made with skim milk Order a nonfat latte instead of a regular latte, and you'll save 90 calories.

5. Old: be a couch potato New: take a 20-minute walk Walk a mile every day, and you'll burn about 100 calories. Twenty minutes is an estimate of how long it takes to walk a mile; some people are slower, and others are faster. For all you pedometer wearers out there, a mile is about 2,000 steps.