Obesity
Obesity is a well known risk factor for OSAHS. Many studies over the years have shown a clear correlation between OSAHS and excess body weight. Even modest gains in weight have led to increased severity of OSAHS. The Wisconsin Sleep Cohort has shown that patients with mild OSAHS have a 6-fold increase in risk for developing moderate or severe OSAHS if they gain only 10% of their body weight [32]. And among those who are most over- weight (BMI of 40), 70% suffer from OSAHS. Therefore, it seems that weight gain increases the chance of develop- ing OSAHS and can worsen the severity of OSAHS in those who already have it
Page 122, Sleep Apnea Current Diagnosis and Treatment, Winfried J. Randerath, et al ed., 2006.
I'm sure there's been more research since this book came out, but it seems that either or both genetics and obesity can be dispositive factors in an individual's OSA. This is an area that has been researched a lot, and no name calling is needed to discuss the ongoing research that is exploring the significance of the various factors that increase risk for obstructive sleep apnea. It's not exclusively one or the other.