Increase or decrease in gene expression

Increased or decreased gene expression is now being linked to a variety of health outcomes, like disease, wellbeing, and aging. The role of methylation seems to play an important role in how cells use DNA. It has been linked to:
aging,
cancer,
embryonic development,
amount of exercise,
atherosclerosis,
the immune system (such as B-cells), and
memory.
Choose one of the health outcomes related to methylation listed above. Conduct research to find out whether methylation is increased or decreased. How does the cause of the change in methylation explain its effect on our health? Use specific details and vocabulary about controlling gene expression in your response.