In life, very rarely is something worth pursuing easy. Shifting to a healthier lifestyle is plastered with so many obstacles. You can plan all you want but you won’t be able to avoid the difficulties that a change in lifestyle entails. You will be battling against yourself and your environment.
It is not meant to be taken literally and it is not too complicated. It simply means what food we eat has bearing on our health. It is an old and basic idea but one that is very relevant to the complicated modern times.