"We're not just changing gradually over time; there are some really dramatic changes," Michael Snyder, PhD, professor of genetics at Stanford University and one of the study's researchers, said in the university's press coverage.
The changes in people's 40s were closely tied to heart disease, skin and muscle function, and how people metabolize caffeine, fat, and alcohol.
Molecular change impacts the body's risk of chronic disease, the ability to fight off disease, and the pace of aging, per the study.
Researchers studied over 100 volunteers between the ages of 25 and 75 who donated blood or provided biological samples every few months over nearly two years.
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