Hmmm....
Tall really cannot help you lar... unless you wanna do it
surgically 
Tallness depends on your
epiphyseal plates in the bone ends (especially long bones). Once it
fuses, which is after 21 for males and around 16 for females, there
is no more chance of becoming any more taller...
Fusion of the epiphyseal plate is caused by sex hormones, estrogen
(guys also have, but minute amount, hence explaining the prolonged
growth)... Some abnormalities occur, where the plates are not
fused, leading to gigantism, some fuse to early leading to
dwarfism...
To become fat, refer dietician
