It's a balancing act. You have to know what treatments are available - medication and non-medication - and decide what's right for you.
I have a coworker who's pre-diabetic. His parents both died of diabetes. And he was a very good to son to them. He lived with them while they were ill and cared for them. His dad practically died in his arms. After his mother was moved to a hospital and then a nursing home, he visited her daily. He spent hours there.
So, he saw what the diabetes did to them. But, still he won't change his diet or lifestyle. He just says, "Give me the meds." That's his right, of course, but some people might make a different choice.
I have two other coworkers who are diabetic. I asked the one lady - who takes 7 medications and weighs over 350 pounds - what her doctor says about diet and exercise. She said her doctor never even mentions it. Maybe her doctor is discouraged by so many patients who aren't willing to change, but I still think every patient should be told of lifestyle changes they can make which might keep them off medication, or make the medication lower.
You see this with type II diabetes, high blood pressure, etc. Maybe that's what your facebook friend was talking about?
It doesn't make sense to get rid of
all meds, of course. That's just silly.