Spoonful Of Sugar’ Makes The Worms’ Life Span Go Down
Surely, not sugar? What’s this? You mean that substance that Dr. Yudkin once termed “the deadly white powder?” Not the one that George Bray said was “harmless?” Yes, that sugar. If worms are any indication, all the sugar in your diet could spell much more than obesity and type 2 diabetes. Researchers reporting in the November issue of Cell Metabolism, a Cell Press publication, say it might also be taking years off your life.
By adding just a small amount of glucose to C. elegans usual fare of straight bacteria, they found the worms lose about 20 percent of their usual life span. They trace the effect to insulin signals, which can block other life-extending molecular players.
Although the findings are in worms, Cynthia Kenyon of the University of California, San Francisco, says there are known to be many similarities between worms and people in the insulin signaling pathways. (As an aside, Kenyon says she read up on low-carb diets and changed her eating habits immediately — cutting out essentially all starches and desserts — after making the initial discovery in worms. The discovery was made several years ago, but had not been reported in a peer-reviewed journal until now.
Well now. Where have I heard this before? Oh yes, in Gary Taubes blockbuster book, Good Calories, Bad Calories. We learn of her worm experiments and also the steps she took at restricting calories based on her own research. She lost a good deal of weight and her health improved dramatically. Well, now Dr. Kenyon is at it again.
“In the early 90s, we discovered mutations that could double the normal life span of worms,” Kenyon said. Those mutations effected insulin signals. Specifically, a mutation in a gene known as daf-2 slowed aging and doubled life span. That longer life depended on another “FOXO transcription factor” called DAF-16 and the heat shock factor HSF-1.
Now, the researchers show that those same players are also involved in numbering the days of worms who are fed on glucose. In fact, glucose makes no difference to the life span of worms that lack DAF-16 or HSF-1, they show. Glucose also completely prevents the life-extending benefits that would otherwise come with mutations in the daf-2 gene.
Ultimately, worms fed a steady diet containing glucose show a reduction in aquaporin channels that transport glycerol, one of the ingredients in the process by which the body produces its own glucose. “If there is not enough glucose, the body makes it with glycerol,” Kenyon explained. That glycerol has to first get where it needs to go, which it does via the aquaporin channels.
Although we do not fully understand the mechanism by which glucose shortens the life span of C. elegans, the fact that the two mammalian aquaporin glycerol-transporting channels are downregulated by insulin raises the possibility that glucose may have a life-span-shortening effect in humans, and, conversely, that a diet with a low glycemic index may extend human life span,” the researchers write. Kenyon also points to recent studies that have linked particular FOXO variants to longevity in several human populations, making the pathway the first with clear effects on human aging.
Now based on this, the researchers would probably recommend some drugs for us to take to help in this, but you, dear reader, don’t have to wait for production. You can improve your life span today. How? Eat a high-fat diet, restricted in carbohydrates, just like Dr. Kenyon did. Such a plan is covered on your insurance and will not have any out-of-pocket expense!Share on Twitter