I will say that I used to like Dr. Oz and he seemed level headed but then things changed. Having a show where you feel you need to provide new products and solutions on a regular basis changed him. Now he seems to back every product with some slight promise. It has nothing to do with big pharma. It has to do with the age old scientific method that works if applied correctly and he ignores that. I've looked into the studies he references and there are often issues or they are preliminary at best.
PubMed is a good place to look into studies and get some of the real information as long as you understand that a single study doesn't prove anything as it should be measurable and repeatable.
You can't out-exercise poor eating habits.