Does your intelligence decrease over time or can medical conditions affect clarity of the thought process?

Mind body : No doubt our health and medical well being impacts on cognition, attention, memory etc. Metabolic issues impact on the efficiency of the brain as do specific diseases, some temporarily and others through accumulated problems over time. Exercise, good sleep and diet, staying mentally active, and keeping good metabolic control, as well as avoiding too much alcohol is wise. Some meds can b problem.