No, it's not a good idea to just start exercising every day. That will lead to overtraining, which is a bad thing. Overtraining can lead to a weaker immune system, lower energy, giving up, irritability, higher chance of injury, and all the things no one wants, especially when wanting to accomplish something through a workout. PACE IT ACCORDING TO WHAT YOU CAN DO, don't forget a day or two for rest at least. Sure, some people can exercise everyday, I know of some active people who run for hours every day, but they have spent years working themselves up to that point. Remember, the biggest loser is a tv show. TV shows are edited for entertainment. How many people want to see a bunch of random people sitting around resting? My coach says a similar thing for gymnastics competitions on tv: why are some people getting scores of 9 when the score should be much lower? Well, who's going to pay to watch someone get a 7? It's edited for entertainment to make money, so I doubt they actually get no rest.
If you don't see results, keep in mind that you must be patient, you must eat a healthy, balanced diet, and you must do a lot of cardio.
I'm not a doctor, but this is what I have been told by professionals.
-Hope this helps