Human Growth and Development / Unit 15 HGD 2153 review, 2 to 3 minutes
Compression of Morbidity
The idea
In nineteen eighty-three, Fries proposed the compression of morbidity: the hope that the onset of chronic disease and disability can be delayed faster than life expectancy rises, so that the years spent ill or dependent shrink and are pushed toward the very end of life. If it holds, longer lives mean more healthy years, not more years of illness. The evidence divides. In twenty ten, Crimmins and Beltrán-Sánchez found that people were living longer with illness rather than delaying it: life expectancy rose, but so did the years lived with chronic disease. In twenty eleven, Fries and colleagues cited longitudinal and intervention studies showing less disability in late life. Part of the disagreement is about measurement. Disease and disability are not the same: a person may live for years with a managed chronic disease, such as diabetes, while remaining fully able. Whether morbidity is compressing can depend on whether one counts diagnoses or limitations.
In practice
Two eighty-five-year-olds with the same diagnoses: one fully independent with well-managed diabetes and blood pressure, the other bedbound, the same morbidity on paper and very different lives.
Where people slip
The misconception is that longer life necessarily means more years of illness, or necessarily means fewer. It depends on what is measured and on the population. Research shows that healthy habits in early and middle life predict later health, and centenarians often show a rapid terminal decline after long healthy lives, consistent with compression for some. Whether it holds across whole populations remains debated. For the exam, know Fries's hypothesis, the evidence on both sides, and the distinction between living longer and living longer in good health. Both camps agree that healthy habits matter.
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