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View Full Version : Low-calorie diet may not prolong life



Artemis
08-30-2012, 06:25 PM
A study spanning 23 years found that monkeys that ate fewer calories than non-dieting counterparts were healthier but did not live any longer.


A low-calorie diet boosts health but does not prolong life, at least not in rhesus monkeys, scientists reported Wednesday in a new study into a long-held link between food restriction and longevity.

Spanning 23 years, the research found monkeys that ate fewer calories than non-dieting counterparts were healthier but did not live any longer.

Rhesus monkeys are a preferred choice for lab study, as they are long-lived primates like humans their average lifespan in captivity is 27 years and the usual maximum is 40 years.

The exceptionally long study, launched at the National Institute on Aging in Maryland in 1987, saw monkeys of different ages fed a diet 30 percent lower in calories than others that followed a "normal," nutritious diet.

Animals in both groups lived on average longer than wild rhesus monkeys and were heavier too. None was malnourished, and they were given vitamin and mineral supplements, the researchers wrote in the journal Nature.

Those on the calorie-restricted diet had a lower incidence of diabetes, cardiovascular disease and cancer than the rest, and dieting males also had lower cholesterol.

"However, these effects did not translate directly to a beneficial effect in longevity," over the control monkeys, Rafael de Cabo of the NIA's Laboratory of Experimental Gerontology, told AFP.

The study was not designed to explain this phenomenon, and the authors say matching research to measure the impact of calorie restriction on longevity in humans was unlikely.

The findings seem to contradict those of other projects, including an ongoing study at the Wisconsin National Primate Research Center, which has shown that rhesus monkeys placed on a restricted calorie diet lived longer.

These "mixed results" raised intriguing questions about the benefits of calorie restriction in primates, Steven Austad of the University of Texas' Barshop Institute for Longevity and Aging Studies wrote in a comment on the study, also published by Nature.

WNPRC senior scientist Ricki Colman told AFP there were many differences between the two studies that may explain the conflicting outcomes.

Importantly, the WNPRC control monkeys (those whose calorie intake was not restricted) were allowed free access to food, therefore mimicking a human in charge of his own nutrition intake.

In contrast, the NIA control group were given a limited amount of food, thus resembling an ideal human diet which may explain why they lived as long as the monkeys on the low-calorie diet.

They were also given vitamin and mineral supplements and the WNPRC group not.

Comparing the two approaches, a compelling picture emerges, said De Cabo: A healthy diet does improve longevity, and eating less of it may slow the onset of some diseases but will not actually prolong life.

Source. (http://www.mnn.com/food/healthy-eating/stories/low-calorie-diet-may-not-prolong-life)

DMXX
10-20-2012, 04:13 PM
Not surprising. Calorie restriction doesn't affect an individual very much unless it is significant.

30% sounds like a lot, but if you flip the figures, the "dieting" monkeys were still consuming 70% of what their generously-fed counterparts were. Translating that into human values, that's a man eating ~1750 calories per day instead of the (British) recommended 2550. Half the men I know eat roughly that amount anyway and don't seem on the brink of death.

The quality of food (i.e. nutrition density, particularly antioxidants) would have been a better measure of longevity, but I'm pretty sure animal rights activists will have no problem opposing anything like that, since giving "junk food" to apes sounds worse than giving them a "little less".

ilmari
10-21-2012, 03:54 AM
700 calories vs the US standard of 2,000 calories [per day] was what I had heard the top end of calorie consumption was supposed to be.

angel10
10-09-2014, 06:49 AM
Although UK and Ireland catch my eye as interesting exceptions, I believe the 25 most inactive countries you list would statistically have a hotter climate than the world average climate temperature (average being a weighted average which takes into account where the people live in the world).

Clinton P
11-11-2014, 04:58 PM
Doughnut burger bust day's calories.

The Double Donut burger consists of two beef burgers topped with cheese, four bacon rashers and BBQ sauce, sandwiched between two glazed ring-doughnuts.

The Double Donut burger contains 53g of saturated fat, and 8.2g of salt.

Click here (http://www.bbc.co.uk/news/health-30000934) to read more about this story.

Clinton P

rms2
11-11-2014, 05:25 PM
I wouldn't eat something like that, but I support the right of others to eat it and of that pub to offer it.

Gray Fox
11-11-2014, 08:15 PM
That it is absolutely ridiculous, but I'd have to try it at least once :hungry:

tamilgangster
05-11-2015, 10:52 AM
Its not about low valories its about getting proper nutrients and excersize. If you eat a low carlory diet but only eat processed food ur not doing any good. Eating a high calorie diet, which is balanced and with proper excersize is whats ideal