its all about diet, you can stay the same weight with the wrong diet and be exercising 4-5 days a week
i have seen it with people before
if you are not disciplined with what you eat, forget about losing weight and getting healthier
its as simple as that...
right diet and exercise 3-4 times a week is more than enough
your body needs time to heal and running everyday can lead to shin splints, joint problems and other problems like arthritis and so forth, try walking every now and then, basketball, soccer, rowing and swimming
make sure you get enough sleep as well, your body repairs from 11pm to 3 am, thats when you should be sleeping and your body needs that period to repair/heal, plenty exercise and the right diet is key but if you are not getting your sleep, it hampers everything
another thing also, exercise in the morning or afternoon, late afternoon, evening and night are the worst times to exercise because your internal core takes longer to cool down, allow your body enough time to cool down, body temp is important
shock your muscles, don't get into routines that your muscles get use to, try different exercises to shock your muscles to get results if your into cutting.
at the end of the day, its about discipline