[kardashian007]

Fat is 9 kcal/g, while protein and simple carbs are about 4 kcal/g. And there is a pathway to absorb complex lipid rather than going through the effort of breaking them down.

The nuances and complexities come in because of individual genetics, state of health and a myriad of interactions between the complexity of foods and their numerous and unpredictable interactions with a constantly changing system.

In order to get a better picture of health and lifestyle consequences will require close to 24x7 monitoring of many parameters (quantified self).

So, for example, it may be possible to find out allergies and almost allergies, interactions before they fully occur and inflammation promotion/reduction properties of lifestyle choices. Add software and deep learning, and there are almost endless possibilities for health and lifestyle micro- and macro-optimizations.