I've wondered if he actually is on diabetes medication. He doesn't have insurance and insulin, needles and testing equipment is damn expensive. He could just be taking an oral medication like Metformin but if his doctor prescribed it he'd be requiring Joh to test and come in for the occasional A1C test, again, which gets expensive if you're not insured.
Guys, is it possible Poorlissa might have exaggerated?!
Sifting through all of Polissa's claims to figure out which ones are true can get challenging, but I do believe Josh has type 2 diabetes—and that he's receiving no treatment at all for it. He's in terrible condition, has recently lost a lot of weight, has no muscle mass, and has developed sores on his legs. This is a 36-year-old man with the body of somebody 20-30 years older. He's falling apart fast.
Getting Josh on insulin and improving his diet should be absolute top priority in that household, because he's the only one capable of earning an income, and because he's going to die in an ugly, painful way—and soon, if he doesn't start managing it properly. I'm sure he feels like warmed-over shit most of the time.
He doesn't have health insurance, but he and Polissa are so low-income, there's got to be some way he can get help. He should get seen by a doctor—be it through a free/charity clinic, or even spending a day at the ER, like so many indigent patients do—because not only will that give him the records needed to support a potential disability claim, but the social workers might also be able to find a way to fast-track him into a state or federal program that can get him insulin and diabetes education.
That said, the sticking points in all this will be Josh, who will need to take charge of his own care and change his own habits, and Polissa, who appears to do all the grocery shopping, and who I don't believe is capable of following through on the needed dietary changes.