When I was first researching my books (mid 1990's) I found articles about how the fashion and diet industries influence ideas and, of course, marketing. Many have the same stakeholders.
Hand in hand, they decided to 'downsize' that is, make sure the measurements which applied to a size 10, now applied to Size 8, under the guise of boosting self esteem (hahaha).
About the same time, the American system of measuring 'overweight' 'obese' and 'morbidly obese' (despite what you have been led to believe they are NOT all the same) was upsized.
So that meant a whole swathe of people who were within the misleadingly named "healthy range" were now listed as 'overweight'.
I'm always tempted to ask, 'Over WHAT weight?'
Callistemon I am not saying I give any credence to this theory but I once worked with a Fashion Editor who believed all the top houses (of that time) designed for thin, shapeless women models, because they (the designers) were gay and that's the shape they looked at as perfection.