Joints? If this is a real question haha hope it helps
Answer:
Estrogen makes you grow faster than testosterone.
The technique in having a flat stomach or not getting bloated is in choosing what you eat. You only have to eat food that are rich in fiber and drink water as much as your body need. You also have to limit food that are rich in sodium, most likely these are the salty food that you eat.
Stabilizing selection... I think it might be right if I'm wrong, sorry if I am.
Alcohol can affect all of those pertaining to your body system if long overuse of alcohol but mostly I believe it will really affect your digestive system