How your body develops is based upon the genetics that are a blend of your parents genetics. So if you have ever heard "Don't you look like your mum/dad!" then that is because of your genes. Genes are made up of a string of proteins that link together like switches to turn on factors of you.
Imagine that there is a really long line of sliders (like a mixing desk in a music studio). There will be one slider for height. One for eye colour, one for hair colour etc. The slider for hair colour may be set to white blond at one end and black at the other end. Where that slider is set for you is entirely personal to you. Same for every other aspect of you.
There are genes (sliders) for lot of food and exercise related factors within your body. How you respond to caffeine is there for example. If the slider is set to one end of the scale then caffeine hardly affects you. If it is at the other end of the scale then you go hyper after one espresso.
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