How much has media coverage (or media hits on keywords) on nutrition,
health, wellness related issues increased in a recent timeframe? (e.g.
2000 til now, last 5 years).

Looking to quantify public attention to these issues in recent years. 
If you need to break it into specific issues like obesity, disease,
exercise, stress management, sleep deprivation, etc. that is okay,
too, just need at least three of these to have a good idea of scope of
increase.

megmilus-ga,

Since 2000, there's been a substantial increase in all health-related
reporting, but the most significant change was reporting on obesity,
which has increased by almost a factor of ten!

Here are the data I obtained from searching for annual data on the
Factiva database, which allows searches on terms in either the
headline or the lead paragraph of a story:


Terms in headline or lead paragraph for the year prior to September 1 
(e.g 2006 = September 2 2005 - September 1, 2006):

Nutrition:

2006 -- 22,797 

2005 -- 22,464

2004 -- 14,778

2003 -- 11,853

2002 --  9,998

2001 --  9,306

2000 -- 10,064



Obesity:

2006 -- 33,690

2005 -- 27,359

2004 -- 20,993

2003 -- 10,335

2002 --  6,090

2001 --  4,161

2000 --  3,414


Health:


2006 -- 576,763 

2005 -- 553,580

2004 -- 470,884

2003 -- 449,835

2002 -- 376,711

2001 -- 345,614

2000 -- 333,009


Disease:

2006 -- 206,152

2005 -- 200,115

2004 -- 153,958

2003 -- 125,649

2002 -- 103,734

2001 -- 115,437

2000 --  73,009


Exercise:

2006 -- 75,461

2005 -- 71,646

2004 -- 67,665

2003 -- 57,588

2002 -- 51,803

2001 -- 43,050

2000 -- 40,104



I trust this information fully answers your question.  

However, please don't rate this answer until you have everything you
need.  If you would like any additional information, just post a
Request for Clarification to let me know how I can assist you further,
and I'm at your service.

All the best,

pafalafa-ga

This is great!  Thanks very much!