Good health is about getting good food. But "Good food" going to be divided by few parts.
1.General idea of what is good foods ? (such as avoiding oily products, less fries, more boiled, not so much red meat but instead fish & chicken, more fruits & vegetables & less processed foods ect . . )
2.Some part of good health is not about products we eat but the way we use them. We say lipid & oils is harmful but yet only "too much" usage. Today, we face the moment where you say "diet" & some people start cutting all their meals, eating smaller, lesser, which is not suit at all. Anything too much or anything too less. It will be harmful for humans. For instance Salt, if we overreact using it, it will cause blinding & if we stop using it & the amount of salt become so low in our body it might cause a disease called "Beriberi" that usually is a common sickness in most of the African countries.
3.We need to take our meals & "good food" definition following our own condition. (Natural metabolism condition, conditions we finds later due reasons & medical reasons & allergies) for instance, i have a bit of constipation, (fruits are part of good nutrition) but too much Banana ? Will take away my good health, but often use of fruits like apple or figs can help that condition of mine. Or my metabolism refer that my bones create it's strength & core (such as Calcium & Iron) much slower than others. So i need to make sure to use foods that help my metabolism with it (or taking it's medicines, vitamins & medicines are part of nutrition plan as well)
4.A good nutrition can work so much better with a good gym & work out. Kind of working together.