People who have a lower socioeconomic status are more likely to opt for the cheaper options when it comes to food for their family, so places like fast food joints that have large portions for less are usually what they go for most often. Fast food places are working to have healthier options, but usually those healthy options are more expensive and are smaller portions/aren't actually that healthy at all. Not only are their food options limited, they are also limited by the healthcare system because even a simple checkup can make a dent in a family's budget if they are living pay check to pay check. So, if they aren't regularly getting blood taken or getting weighed, they may not know that they are obese and putting their body at risk for health issues. Exercise also takes time which people in the working class don't have much of which poses yet another obstacle for those in the lower class when it comes to having opportunities to live a healthier life.