But, Michelle Obama is keeping things really real and was recently seen promoting her line of healthy kids beverages, PLEZi ...

she walks the walk -- and the drinks she was promoting at this seemingly casual trip to Costco back that up. Just look at the difference between a Plezi Fizz soda and a similar serving of Coke.

Costco shoppers in Livermore, California were surprised on Tuesday to find the author and children's health advocate standing at the end of an aisle holding up a case of PLEZi FiZZ, a soft drink ...

Holding up a case of Plezi Fizz, a beverage for kids ... and apple smash. RELATED: Costco Shopper's Email to CEO About 'Disgusting' Product Got a Wild Response Shake and Stir Co., mobile ...

"During her Costco appearance, she spoke to customers about the brand’s latest absurdly good beverage, PLEZi FiZZ." The company also noted the product has less sugar than a traditional soft drink.