There has been increasing evidence for high intensity training in terms of changing and improving your metabolism in terms of insulin resistance. This may have benefits in terms of improving you metabolic profile over the long term.
How does it work?
20 secs of maximal effort in between normal steady paced exercise for three interval that's it.... three times a week.
This may be of benefit but has to be taken in context. Weight reduction is aided by exercise. The mental and physical benefits of exercise are well documented. This is not an alternative but may be incorporated into an exercise program. Remember before starting a high intensity exercise program have a chat with your doctor if you are not used to exercise.
Also weight reduction in overweight patient's is an important part of improving overall health, but remember diet is far more important than exercise.