If you read the medical literature (research papers etc). Long Covid symptoms, which weight gain can be a symptom in some, is theorized to be based on this phenomena of micro clotting. Most people think weight gain is purely a function of caloric consumption. When in fact issues like metabolic syndrome, inflammatory issues, can cause a disproportionate weight gain.
Friend, if you had the excess burden from a constellation of micro clots peppered throughout your body (hypothetically). How efficient would your body's function be? Not to mention something as simple as the burden on your respiratory system. It's a insult to your circulatory system first but an additional, rather large wound that would need to be addressed. People often don't lose weight when their systems are highly inflamed.
Google long covid and amyloid fibrin clots.