That Snickers Bar you pick up at the store is about to get smaller;  And - you can thank Michelle Obama's Let's Move! campaign.

The company that produces M&Ms, 3 Musketeers, Snickers and Twix bars has vowed to stop shipping any Mars chocolate products that exceed 250 calories per portion by the end of 2013.

Right now a regular Snickers bar has 280 calories and each Twix cookie bar has 130 calories.

The shrinking size of your favorite candy bar is the direct result of Obama's health directive.

This move is part of an agreement Mars signed with Michelle Obama's Partnership for a Healthier America. Mars is part of the Healthy Weight Commitment Foundation, a group of 16 manufacturers who have pledged to reduce 1.5 trillion calories by the end of 2015 through lower-calorie options and reducing portion sizes.

The new size comes after changes Mars Inc made earlier last year.

Mars' statement goes on to note that the company has removed 97% of the trans fat in their chocolate products and plans to "reduce sodium levels in all Mars Food products globally by 25 percent by 2015."