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Greenery surrounding a person slows down the aging process

26.10.2021

Plants around a person are good for the mind, but can they be good for the body too? Monash University researchers have found that this may indeed be the case, at least for women.

For the first time in the world, scientists have shown a link between the amount of vegetation in the human immediate environment and slower biological aging, based on the study of DNA methylation.

With an aging global population driven by increasing life expectancy and declining fertility, understanding how to maintain good health and productivity in old age is a priority. One of the most reliable markers of biological aging is the aging-associated methylation changes found in human DNA. It is here that some sections of DNA are covered with methyl molecules.

Some regions of DNA have CpG regions that are particularly prone to increased methylation with age, and this limits the functionality of the affected genes. Conversely, aging can also reduce methylation in other areas, leading to overexpression of genes that can be just as detrimental.

The team used infrared and visible light readings from a NASA satellite to estimate local vegetation mass in the 12 months prior to each participant's blood draw. Plants absorb visible red light for photosynthesis, but highly reflect infrared and near-infrared light. The researchers used this - and some rather complex mathematical formulas that accounted for atmospheric distortion in light readings - to estimate the density of greenery up to 2 km away from their homes.

"We found that using the most robust of the algorithms, GrimAge, an increase in ambient greenery was associated with slower biological aging," the scientists noted. "Our study shows that a 0,1 unit increase in vegetation index within a 500-meter radius of home is associated with a 0,31-year reduction in biological aging as measured by GrimAge. Previous cohort studies tell us that this is equivalent to a reduction in all-cause mortality by 3%. The association remained stable when measuring greenery at a distance of 300 meters, one kilometer and two kilometers from home."

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