How much Really do our eating, exercise habits, or even bad habits effect who we truly are?

Basically what I mean is, I see people who smoke cigarettes for instance, are usually a little bit more on the anxious side. Now please don’t misunderstand me, I’m not trying to set stereotypes. I am just going off of my own personal experience and a little observation. I used to be a smoker for 10 years myself. After I quit I felt less anxiety and in general, more healthy and motivated all around. This is only one example of a bad habit. How about a persons eating or daily diet regimen for example. A person, who say, eats more fried foods than fresh, baked ect... How much does our eating, exercise, and daily habits really effect our mental decisions, and even spiritual life?How much Really do our eating, exercise habits, or even bad habits effect who we truly are?
Omg it does a lot!! Alot of people don't realize that, but ever since i've started carrying this baby i've been eating right and i feel so much lighter, positive and energized..its something i will continue to do even after i give birth.
Considerably. Spiritual is different. Your body will always militate against your spirit or vice versa. Til the spirit wins if you've got what is needful. The body - a temple. In other words an empty vessel until it has something worthy IN it. No consideration to what it looks like on the outside. Scope the Parthenon. I doubt anybody wants to rent it as living space. A reminder of what was.