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Originally Posted by tmcdmck
the last two point were absolutely conflating correlation and causation
When you are dealing with health and biological systems ultimate "causation" is pretty much impossible to determine because the systems are too complex. However, regardless of "causation" numerous epidemiological studies have proven without a doubt that all else being equal obesity correlates with poorer health and that for an obese person in poor health losing fat weight will improve health.
And the most efficient way to become obese is to consume fatty acids at an excess of metabolic needs, although obesity can also be accomplished by overconsumption of sugars or proteins, albeit less efficiently.
If you want to get into "causation" there is a lot of current lipid research studying the role of adipocytes as endocrine systems and their role as active players in effecting metabolic (and other) systems leading towards poor health. However, there is still much to be learned and the causation is nowhere near as well understood as the correlation.