I am looking for the  proclivity toward dieting  of the following
demographics. Idealy,  what percentage have dieted in the past, are
currently on a diet or plan to be on a diet in the future?
 
The segments are below:
1.  Business travelers
2.  African American adult women
3.  People purchasing clothing/dieting to wear better/more flattering clothes
4.  Getting ready for swimsuit season - losing weight before wearing swimsuit

Pease provide numbers or data on each of the above segments.

Are you interested only in continental USA age 8 to age 80, mentally,
finacially and physically passible?   Except 2, these are difficult to
define sharply. Now that it is not politically correct to indentify
African Americans, item 2 will also be skewed. Is someone who drives
100 miles per decade to visit customers, a business traveler? Am I a
business traveler if I travel to a public meeting of the city council
occasionally? 150 million people fit 3 occasionally and briefly. I'll
guess 40 million fit 4 occasionally and briefly. I see no way to
evaluate the degree of resolve, unless they buy a costly weieght loss
program or diet. Even then they may be more motivated by health, a
nagging spouce and employment concerns than how they look. I'll guess
50% of the population for 1,2 and 3. Only about 1/2 the population
would wear a swim suit even if they did look good. 3/4 if you include
sun ware, sports ware and other clothing that shows lots of skin. 
Neil