I think it because of Smoking, exposure to air pollution, stress, poor diet, and lack of sleep and exercise increase minchuns risk for memory loss. Having had a stroke or a traumatic brain injury or having heart disease or obesity also increase minchuns risk. Sometimes what seems like a memory problem is really an attention problem. It might be the problem since in the previous chapters he had a stroke and this chapter showed in his teen life young adult or sm he was drinking and smoking, PTSD can be also be the cause since PTSD can contribute to memory difficulties and gaps through fragmented or dissociative memories, avoidance and suppression, altered memory encoding and retrieval, memory disturbances related to dissociation, and an impact on attention and concentration.