Use Smart Google, like we have talked about in the tutorials, to search for grants.
site:.org ((fund* OR grant) AND nutrition)
Can also try site:.gov or site:edu with your topic
If you have found a government grant that looks promising, but cannot locate the submission form or details due to the deadline being passed then check out the following links.
Source: https://www.grants.gov/grantors.html
Directions: https://www.grants.gov/help/html/help/index.htm#t=Grantors%2FRetrieveSubmittedApplications.htm