Where did you get that erudite information?
A lot of experience in the field.
Of course, if you were starving, then anything you eat will make you healthier.
But, for example, if your cholesterol is high, you can’t eat something to make your cholesterol lower. Similarly, you can’t eat something to make your blood pressure lower. And you can’t eat something to make your kidneys healthier.
But there are plenty of things you can avoid eating and doing that will correct those deficiencies.