It's not.

>>34513225
What?

>

>>34513225
Congratulations. You've realized that people who say either thing are equally retarded.

>>34513491
Congratulations. You're retarded.

>>34513225
Every change to your body probably has at least some relation to your genetics.

Your genetics don't determine how much fat or muscle you store. Just where you store it.

The placement of muscle is purely generic. How muscle is made isn't as well understood as fat. Fat loss is 99% calories in calories out. The other 1% is the small generic variance for different metabolic rates but with that considered it's 100% thermodynamics. Fat placement is generic though.

>>34513225
what it's all genetics is the muscle placement
the muscle gain % is not
so is the bf % loss

>>34513225
Fat is controlled by energy in and energy out.
Almost everyone can gain a certain amount of muscle, but your muscle gain and natty limit is determined by hormones and your method of working your muscles.
It's not all genetics, but for someone who works hard and puts in a lot of effort, genetics will determine the final result.