sick from birth and recently disabled - slighlty improving with peating

[Hans]

If you have low blood platelets, can this then increase serotonin's influence in the body? Thanks Hans

Not necessarily, but maybe. You have to check urinary 5-HIAA and that should give you a good idea of how much serotonin is in your blood. If someone has gut issues, fatty liver, excess fat and insulin resistance, then they most likely also have elevated serotonin.