en rapport avec la cuisine, c'est peut-être simplement ça?

proposé pour une cuisine saine

Could really do with more context here, or rather confirmation of how exactly the context is shown in the text. I'm taking it to mean that there's a long list of reasons for including or excluding a particular person from this market reasearch. The list starts with age groups, which may qualify or disqualify; gender could be another, etc. Then you come down to the less objective criteria that the researcher assesses from not only the answers given but the manner in which they're given, and their own personal assessment of the interviewee's suitability.

Obesity could quite logically be used as a qualifier for a questionnaire on diet, and OB is a recognised medical abbreviation, I believe. And particularly useful where one would not want the interviewee to understand the tick-box ;).

http://www.abbreviations.com/OB


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Note added at 1 day5 hrs (2014-06-21 14:55:13 GMT)
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OTOH, there are other possibilities, so I would say this one needs to be referred back to the client.

It could stand for "out of bounds" i.e. too old, too young etc - whatever.
It could also mean that the interviewer is pregnant. This would be an excluding factor very often in a questionnaire about diet, and ob/gyn is the medical term for everything to do with that side of a woman's life.

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Note added at 1 day5 hrs (2014-06-21 14:57:15 GMT)
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Sorry, I just realised that is EN>FR, so my first answer would need to be spelt obèse. But I stand by my recommendation to check with the client.