The ad in question, which is also shown in the US, shows a variety of activities like dog walking, dancing and laughing that it says would burn off the 139 calories in a single serving of the soft drink.
But the Advertising Standards Authority, which regulates advertising in the UK, says the ad doesn't make clear enough that all of the activities need to be done in combination in order to burn 139 calories.
Coca-Cola representatives did not immediately return a request for comment.
