Hi Ousaima,

fatty liver is advanced ;-) You can read in the wiki: "Fatty liver develops in chronic stress phases of ((Digestive - Liver - Parenchyma|hepatocytes)) and ((Endocrine - Pancreas - Alpha Islet Cells|pancreas alpha cells)) with enhanced storage and decreased fat reduction in the liver." That means that there is both an aspect of starvation and of disgust or refusal, that make the liver cells store fat in excess. One could say, figuratively it creates a protective layer as a resource.
The liver cells here follow the "old brain" theme and pattern (starvation, function plus), while the pancreas islet cells follow the "new brain" theme and pattern (resistance, function minus).
This answers the other question (1) you had.
Corona symptoms are typically new brain-related, often created by fears and self-doubts. In a [https://www.cdc.gov/pcd/issues/2021/21_0123.htm#T2_down|table by the CDC] you can read this: ""Certain underlying conditions and the number of conditions were associated with severe COVID-19 illness. Hypertension and disorders of lipid metabolism were the most frequent, whereas obesity, diabetes with complication, and anxiety disorders were the strongest risk factors for severe COVID-19 illness. " 
But instead of using labels like "Corona", we rather look at each symptom and organ that is reacting.