I think I edited the post after you replied, but basically fatty liver (non-alcoholic that is) is caused by insulin resistance. High blood sugar and insulin resistance damage your endothelial walls (and kill your erections). I invite you to research this topic heavily. Evaluation of endothelial dysfunction in patients with nonalcoholic fatty liver disease: Association of selenoprotein P with carotid intima-media t... - PubMed - NCBI
Also: "Classically, insulin metabolic signaling results in vasodilation via increased nitric oxide (NO) production and increases in bioavailable NO. However, in conditions of insulin resistance, it promotes vasoconstriction and vascular proliferation. Insulin effects on endothelial cells." New insights into insulin action and resistance in the vasculature
So you have any sort of blood sugar issues or insulin resistance or are pre-diabetic you will be more often in a vasoconstricting state. This is why you can get an erection but it fades quickly.
You can also look thin and still be insulin resistant.
As I said in the first post - you might also have too much norepinephrine (stuck in 'flight mode') and this causes vasoconstriction (get a boner but it fades quick). But again, this is highly correlated to insulin resistance and fatty liver. To test this you could try some norepinephrine blocking compounds and see if your erections improve.
Also: "Classically, insulin metabolic signaling results in vasodilation via increased nitric oxide (NO) production and increases in bioavailable NO. However, in conditions of insulin resistance, it promotes vasoconstriction and vascular proliferation. Insulin effects on endothelial cells." New insights into insulin action and resistance in the vasculature
So you have any sort of blood sugar issues or insulin resistance or are pre-diabetic you will be more often in a vasoconstricting state. This is why you can get an erection but it fades quickly.
You can also look thin and still be insulin resistant.
As I said in the first post - you might also have too much norepinephrine (stuck in 'flight mode') and this causes vasoconstriction (get a boner but it fades quick). But again, this is highly correlated to insulin resistance and fatty liver. To test this you could try some norepinephrine blocking compounds and see if your erections improve.