@georgia the highly refined starches and sugars are inflammatory and there is a major gut-brain connection with neurotransmitter regulation. if your gut as chronic inflammation it can have systemic effects. you could benefit just from shifting to whole grains and eliminating the ultra processed refined sources
serotonin plays some role in emotional state, but yah the theory of blocking reuptake fixing depression, i'm skeptical about that too. i think depression is typically more metaphysical and spiritual and needs to be addressed at the root not masked with drugs