Originally Posted by Ectomorph42
but I noticed that I'm losing weight, is it normal? is it really optimal to train in that frequency? or it is better to train less frequent in order to balance my calorie intake and calorie expenditure?
There are many reasons you could lose weight:
Decreased water intake
Not enough food for activity level
If you don't want to train that frequently, then don't. If you do, and you notice yourself dropping weight, than you may need to eat more. Don't make this overly complex.