What you need to eat now is not the same as what you needed to eat when you were an infant, a decade ago, or, what you will need to eat in ten years.
But, it’s not just time that changes it. It is also what you do.
For example, if you take up a rigorous exercise program tomorrow, after not being on one today, then, you may need more fuel.
So, yes, you’re given a deck of cards (your DNA).
But you can also choose which ones to play with.