There can be a tendency for researchers and commentators to become attached to one particular area and not be able to see the relationship and interconnectedness with the different aspects of the same disease.
Also, much research is focused on individual components of nutrition, such as individual minerals, vitamins, or components such as fats or saturated fats.
Once again, researchers can become attached to one particular element of nutrition. We search for the magic supplement or the one miraculous cure.
Nutrition is the result of endless number of components in food. Health is the result of the relationship between all that we eat (and absorb during digestion), our relationships with others, the community that we live in and the world that we inhabit.
Looking at individual components of food in isolation can never give a complete picture.