exercise vs calorie intake

You're not wasting your time. Exercising is never a waste of time. They might be referring to the whole "starvation mode" thing. The fact remains if you limit your calories and exercise you will lose weight and do something good for your body. Now, if you don't eat enough calories your body will eventually begin to try to store those calories as a natural process. However, if you continue to exercise you will continue to lose weight. It might slow you down, but it will happen. Think biggest loser. They go on restricted diets and work out like mad and they lose massive weight. Now, don't try what they are doing, they are closely supervised in their regimen. What your doing is okay, although you should try to stay above 1200 in my opinion.

Usually people need at least 1200 calories for the body to have energy to function. Also if your not consuming enough calories and your body is working out it doesn't have enough calories to convert into muscle. Usually it is okay to have 100 calories or less left over from your daily calories, but it sounds like you can afford to get closer to your a little under 1500 calorie count. Lastly, and I haven't done enough research to know if this is true but they say if your body constantly doesn't get enough calories it goes into starvation mode and stores your fat. Again haven't done that much research on that but it sounds logical.