He could make sure he exercises regularly to keep the blood flow pumping to his heart, he can eat healthy so that he does not have a lot of fat build up in his arteries and he can also stay away from smoking to keep his body functioning properly.
Cavities accommodate organs and other structures; cavities as potential spaces contain fluid. The two largest human body cavities are the ventral body cavity, and the dorsal body cavity. In the dorsal body cavity the brain and spinal cord are located.
I would recommend that Samuel takes Vitamin C and D but not necesarily from a supplement. He needs a nutritional diet nonetheless and needs to cut excess sodium out of his diet. I would have him return bimonthly for workups.
I hope this helps. The way a human looks at society affects their choices beliefs and bias on controversial topics such as the BLM movement right now where there is a lot of unrest in the world because of clashing opinions.