You may have to give up some pleasure if you want to live longer
Want to slow ageing? You might want to ditch the moisturiser and eat less.
Scientists at Brigham Young University have published research that show cutting kilojoules affects ageing inside a cell. They found that ribosomes – the cell’s protein maker – slow down when kilojoules were cut and that, in turn, this kilojoule-restriction led to longer, healthier lives in mice.
“When you restrict kilojoule consumption, there’s almost a linear increase in lifespan,” Brigham Young University biochemistry professor and senior author John Price told Science Daily. “We inferred that the restriction caused real biochemical changes that slowed down the rate of ageing.”
The research, published in Molecular & Cellular Proteomics, includes the study of two groups of mice, one with unlimited access to food, the other restricted to consume 35 per cent fewer kilojoules, but still receiving all the necessary nutrients for survival. Ribosomes slowed down in the group on a restricted diet, apparently slowing the cellular process of ageing as well. The kilojoule-restricted mice were also more energetic.
“The ribosome is a very complex machine, sort of like your car, and it periodically needs maintenance to replace the parts that wear out the fastest,” Price said. “When tires wear out, you don’t throw the whole car away and buy new ones. It’s cheaper to replace the tires.”
Other studies have shown a connection between fewer kilojoules and longer lifespan, but the Brigham Young team is “the first to show that general protein synthesis slows down and to recognise the ribosome’s role in facilitating those youth-extending biochemical changes.”
Ribosomes use about 10 to 20 per cent of a cell’s total energy to build the proteins that allow the cell to function. When ribosomes slow down at their jobs, it gives them more time to repair themselves.
Before you begin cutting back on your meal portions, however, consider this: Researchers warn that kilojoule-restriction as a fountain of youth hasn’t been tested in humans and results in mice don’t always translate to our species.
“Food isn’t just material to be burned – it’s a signal that tells our body and cells how to respond,” Price said. “We’re getting down to the mechanisms of ageing, which may help us make more educated decisions about what we eat.”
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