The company changed its “Simply Natural” line of Frito-Lay chips to simply be called “Simply,” although the ingredients remain the same. Similarly, its “Natural Quaker Granola” got a makeover as “Simply Quaker Granola.”

The food and beverage giant says the name changes, which took place last year, are the result of it updating its marketing. However, they come at a time when PepsiCo and other companies face legal challenges over their use of the word “natural.”

The Food and Drug Administration does not have a definition for what constitutes “natural,” but says it does not object to the word’s use as long as the product does not contain “added color, artificial flavors or synthetic substances.” Still, a number of lawsuits recently have challenged whether the ingredients in products labeled as “natural” fit that billing.

In some cases, companies are realizing the use of “natural” isn’t worth the headache, said Steve Gardner, director of litigation for the consumer advocacy group Center for Science in the Public Interest, an advocacy group that has filed lawsuits against companies on the topic.

Last year, PepsiCo agreed to remove the words “all natural” from its Naked juices after a lawsuit noted the drinks contained artificial ingredients, such as a fiber made by Archer Midland Daniels. Another ongoing lawsuit filed in 2012 has challenged its description of some of its chips as “natural.” And in November, PepsiCo killed off its Gatorade Natural line, saying the drinks did not “resonate” with its core consumers.

“We constantly update our marketing and packaging,” said Candace Mueller-Medina, a spokeswoman for PepsiCo’s Quaker brand.