Alright, I am quite confused about what needs to be done in order to preserve muscle mass while cutting down.

What I found out so far is that cardio is a must, proper calorie deficit as well as Heavy Lifting in order to keep the muscle active and make my body "think" that the muscle is important.

If this is true, then there is another thing that I always read saying that if you lift heavy and don't have enough calories, you WILL LOOSE muscle mass.

Ok, so which the F is true then? It doesn't make any sense.

Someone please clear this up for me.