Kellanova produces and markets convenience foods and snack foods, including crackers and toaster pastries, cereal, and markets their products by several well-known brands including the Kellogg's brand itself, Rice Krispies Treats, Pringles, Eggo, and Cheez-It.

Outside North America, Kellanova markets cereals such as Corn Flakes, Rice Krispies, Frosties and Coco Pops.

[4] Other corporate office locations outside of Chicago include Battle Creek, Dublin (European Headquarters), Shanghai, and Querétaro City, Mexico.

For years, W. K. Kellogg assisted his brother in research to improve the vegetarian diet of the Battle Creek Sanitarium's patients, especially in the search for wheat-based granola.

As a result, the brothers fell out, and W. K. launched the Battle Creek Toasted Corn Flake Company on February 19, 1906.

The resulting legal battle, which included a trial that lasted an entire month, ended in December 1920 when the Michigan Supreme Court ruled in Will's favor.

From 1969 to 1977, Kellogg's acquired various small businesses, including Salada Tea, Fearn International, Mrs. Smith's Pies, Eggo, and Pure Packed Foods;[15] however, it was later criticized for not diversifying further, as General Mills and Quaker Oats had.

LaMothe and his team took this critique as a challenge, shifting their focus to approaching the demographic of 80 million baby boomers rather than marketing children-oriented cereals.

Kellogg's also introduced new products, including Crispix, Raisin Squares, and Nutri-Grain Biscuits, and reached out internationally with Just Right aimed at Australians and Genmai Flakes for Japan.

Kellogg's also owns the Bear Naked, Natural Touch, Cheez-It, Murray, Austin cookies and crackers, Famous Amos, Gardenburger (acquired 2007), and Plantation brands.

[18] In 2012, Kellogg's became the world's second-largest snack food company (after PepsiCo) by acquiring the potato chip brand Pringles from Procter & Gamble for $2.7 billion in a cash deal.

[20] Earlier that year, Kellogg's also opened new corporate office space in Chicago's Merchandise Mart for its global growth and IT departments.

[24] On April 1, 2019, it was announced that Kellogg's was selling Famous Amos, Murray's, Keebler, Mother's, and Little Brownie Bakers (one of the producers of the cookies for the Girl Scouts of the USA) to Ferrero SpA for $1.4 billion.

[34] On December 21, 2021, about 1,400 Kellogg workers approved a collective bargaining agreement, ending the strike, which had lasted 77 days.

Foremost among these is the design of the Kellogg's logo by Ferris Crane under the art direction of famed type guru Y. Ames.

[citation needed] With the rising popularity of patent medicine in early 20th century advertising, The Kellogg Company of Canada published a book named A New Way of Living that showed readers "how to achieve a new way of living; how to preserve vitality; how to maintain enthusiasm and energy; how to get the most out of life because of a physical ability to enjoy it".

[90] It and its associated products Frosted Flakes and Rice Krispies were also major sponsors for the PBS Kids children's animated series Dragon Tales.

Kellogg's made its first foray into auto racing between 1991 and 1992 when the company sponsored the #41 Chevrolets fielded by Larry Hedrick Motorsports in the NASCAR Winston Cup Series and driven by Phil Parsons, Dave Marcis, Greg Sacks, Hut Stricklin, and Richard Petty, but they gained greater prominence for their sponsorship of two-time Winston Cup Champion Terry Labonte from 1993 to 2006, the last 12 years of that as the sponsor for Hendrick Motorsports' No.5 car.

[100] Its sponsorship at the 2018 Winter Olympic Games featured American athletes Nathan Chen, Kelly Clark, Meghan Duggan and Mike Schultz.

[103] Kellogg's donated around US$2 million opposing California Proposition 37, a 2012 ballot initiative that, if enacted, would have required compulsory labeling of genetically engineered food products.

[110] In January 2012, Kellogg's gave the Calhoun School a $250,000 grant for a "three-part youth-based project on issues of white privilege and institutionalized racism".

"[114] The FTC had previously found fault with Kellogg's claims that Frosted Mini-Wheats cereal improved kids' attentiveness by nearly 20%.

[115] The Children's Advertising Review Unit of the Council of Better Business Bureaus has also suggested that the language on Kellogg Pop-Tarts packages saying the pastries are "Made with Real Fruit" should be taken off the products.

The company responded by saying that they assumed their sponsorship was implied by putting their name on the group, but agreed to stop describing the council as independent.

[120] Food bloggers are also questioning the marketing methods used by cereal manufacturing companies such as Kellogg's, due to their high sugar content and use of ingredients such as high-fructose corn syrup.

[124] On June 25, the company voluntarily began to recall about 28 million boxes of Apple Jacks, Corn Pops, Froot Loops and Honey Smacks because of an unusual smell and flavor from the packages' liners that could make people ill. Kellogg's said about 20 people complained about the cereals, including five who reported nausea and vomiting.

2-Methylnaphthalene is a component of crude oil and is "structurally related to naphthalene, an ingredient in mothballs and toilet-deodorant blocks" that the EPA considers a possible human carcinogen.

Use-by dates printed on the recalled packages ranged from April 1, 2013, to September 21, 2013, and were accompanied by the letters KB, AP or FK.

[132][133] Kellogg's alleged not being aware of the child abuses due to traceability; Amnesty's human rights director replied that "Using mealy-mouthed excuses about 'traceability' is a total cop-out.

"[134] In October 2021, over a thousand employees at four Kellogg's manufacturing plants in the United States went on strike for better working conditions and higher wages.