beyond not over-eating, getting plenty of sleep and regularly exercising my life hack is ...

CUT OUT TOXIC PEOPLE FROM YOUR LIFE.

stress has DIRECT physiological effect through cortisol and other stress hormones causing elevated blood sugar which of course in turn ruins your whole body ...

YOU DO NOT HAVE TO TOLERATE STRESS OR PEOPEL WHO CAUSE IT.

once you took care of those 4 bases - overeating, regular exercise, plentiful sleep and avoiding stress - the rest is in G-d's hands.