That's not really true, the body actually has pretty profound effects on the mind. For instance, there are working theories that many mental disorders are actually metabolic disorder, some neurotransmitters are majority produced in the gut (seratonin), and even things like an elevated heart rate will create emotional states of anxiety even if you're not consciously anxious of anything. That's like the tip of the iceberg. (Also I don't think you can minimize hormones.. ever met a teenager?)