Begin with a well-focused research question.
What is the dietary intake of dairy products by adolescents in the U.S.?
What are the main terms in this question?
dairy products / dietary intake / adolescents / United States
Synonyms, words that mean the same thing or are closely related to your main search terms, can help expand your search appropriately.
|diary products||dietary intake||adolescents||United States|
Boolean operators such as AND & OR are used to connect synonyms & concepts.
Here is the search string that can be used to search the database:
(dietary intake OR food intake) AND (dairy products OR milk OR cheese OR yogurt)
dietary intake & food intake are synonyms for one concept, so they're connected by OR & placed within parentheses.