Cereals industry
To find out information about the trends (issues, external environment) go to IBISWorld and search for cereals. Then go to the industry profile and open the tab that says Industry Outlook. That will tell you what is forecast to be happening in the future. Industry Performance will tell you what's going on now.
To find out information about specific companies and/or cereals such as Raisin Bran, try Business Source Premier and ABI/Inform to find articles. Don't try for scholarly or academic articles, as they are rarely timely.
Statista will have information and statistics on both the industry, individual companies, and brands.
Answer
To find out information about the trends (issues, external environment) go to IBISWorld and search for cereals. Then go to the industry profile and open the tab that says Industry Outlook. That will tell you what is forecast to be happening in the future. Industry Performance will tell you what's going on now.
To find out information about specific companies and/or cereals such as Raisin Bran, try Business Source Premier and ABI/Inform to find articles. Don't try for scholarly or academic articles, as they are rarely timely.
Statista will have information and statistics on both the industry, individual companies, and brands.