Some topics to think about:
Encouraging healthier food choices, providing cleaner water, solutions for obesity and related health problems, better health information delivery systems, using genetic information to sense changes in the body
Background Information & Topic Overviews
For our PICO example, let's look at whether walking is effective for weight-loss in a sedentary adult population. Since PICO was initially developed for health science practitioners, identifying our five Ws is easy.
Who - sedentary adults
What - overweight
When - ongoing
Where - anywhere
Why - to lose weight
How - walking
Our P (population) element is sedentary adults and our I (intervention) element is walking.
Searching those 2 terms in Academic Search Premier yields 59 results, 56 of which are from scholarly journals. Searching in PubMed, one of the more health-focused databases yields 830 articles, many describing the results of clinical trials.