Use PICOT to formulate a clinical question and identify keywords for your search.
For example:
P = Patient or Population or Problem
"thirty year old woman, 14 weeks pregnant with her first child.....BMI of 32"
Keywords: pregnant, pregnancy, prenatal, antenatal, obese, overweight, pregnant, pregnancy, prenatal, antenatal
I = Intervention
"dietary or lifestyle interventions"
Keywords: lifestyle, diet, exercise
C = Comparison
usual care
O = Outcome
"limit her weight gain during pregnancy"
Keywords: weight gain, excessive weight
T = Type of study
Question = therapy; study type = RCT or systematic review
Tutorials on formulating a clinical question
Formulating Answerable Questions CEBM University of Toronto
Use keywords identified in the PICOT to form a search strategy:
obese OR overweight
AND
pregnant OR pregnancy OR antenatal OR prenatal
AND
lifestyle OR diet OR exercise
AND
weight gain OR excessive weight
Use the type of study to consider applying limits:
limit to Systematic Reviews or RCTs
The table below explains how Boolean Operators (AND, OR, NOT) work