T-Faz
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Well if you're on a weight loss program, a 1500 calorie diet should promote weight loss and not cause any malnutrition.
As far as aerobic exercise is concerned, you definitely need to do it for longer periods, but you need to lift weights as well counter balance any muscle loss due to any reason
The 1500 cal diet isn't suitable for all, the calorie intake should be adjusted according to ones height and weight. Then of course you adjust the percentage of proteins:carbs:fat intake in accordance with what you want to achieve.
Similarly if your diet is inadequate then your metabolic system will break soft tissue to gain energy for the exercises that one might be doing.
The reason for this is that the body suddenly undergoes an extreme change in dietary intake and activity factor leading it to decide that muscle would be a better source for energy because if these extreme conditions continued then it would oxidize fat as the last resort. Fat of course provided most energy (ATP) and that is why it is the last energy source to be utilized by the metabolic system.