Saturday, November 29, 2014

Nice video on NAD

Lower NAD in old age interferes with sirtuin activity, and may be behind the negative results on lifespan of resveratrol on normal rodents

interesting antiaging talks

Saturday, November 22, 2014

A response to a post in josh mitteldorf's site

 "but only 15% to dogs and 5% or less in Rhesus monkey experiments reported last year. "

The 16% on dogs, was on 25% CR, iirc not maximal 65% CR.   Human igff1 levels have been influenced by protein intake, which may also affect other long lived species igf1 which may affect longevity

As for the primate study the earlier findings of small benefits were questioned this year.   It seems that not only have several monkeys who started CR in adulthood exceeded the maximum lifespan in captivity of the species studied, but those not on CR experienced triple the risk of death

Regards resveratrol, it has not only extended the life of fish, worms, yeast, obese mice, but also mitochondrially dysfunctional mice and several types of senescent accelerated mice strains.   It also tripled human cell survival upon exposure to gamma radiation.    Why it failed on normal mice, is a good question....  the fact that their nad goes drastically down with age, iirc, could be a culprit as this might handicap sirtuin activity which necesitates it, iirc, even in the presence of sirtuin activity enhancing compounds such as resveratrol. -Darian S, link to post in blog

Saturday, November 1, 2014

Short term extreme CR leads to extreme weight loss and appears to cure type 2 diabetes in small group of patients

 Desperate for information, I headed to the web, where I found a reportabout a research trial at Newcastle University led by Professor Roy Taylor. His research suggested type 2 diabetes could be reversed by following a daily 800-calorie diet for eight weeks....

Others have also changed their lives through the diet. Carlos Cervantes, 53 and from the US, was at death's door when he tried it. He weighed 120kg, suffered a heart attack in spring 2011, his eyesight and kidneys were failing and he faced having an infected toe amputated. He even had fungus growing out of his ears, feeding on his ultra-high blood sugar levels. But after seeing a TV report on the Newcastle research, he started eating only 600 calories a day, replacing the supplements with not just vegetables but fruit, lean chicken, turkey, occasional bread and a daily milkshake. Two months later he had lost 40kg and 18 months later he is still free of his type  2 diabetes...-link1

The small study, which was followed independently by people in the above article, will be looked into with a bigger study involving 100s of patients as seen in the following quote.   Of course extreme CR probably requires medical supervision and should only be used short term to avoid side effects.

 Overweight patients who were put on a diet of just 800 calories a day were free of the disease within a few weeks of following the strict regime....
The diet, which was tested on 11 patients, is a key part of a new £2.4million medical trial of almost 300 people with obesity-induced diabetes....
In healthy people, the liver should contain around two per cent of fat, but in obese people, it can reach 40 per cent and suppress insulin production. Professor Taylor said the results were “enormously exciting”.
He added: “The good news is that if you cut fat in the diet then the liver fat falls very rapidly and that means the pancreas can start working again.”
The new study will see 280 patients with Type 2 diabetes monitored for several years – with half of them on a crash diet for eight to 20 weeks.
Professor Lean said: “We’re confident that some people with Type 2 will be able to achieve remission.-link2

Wednesday, October 29, 2014

Excerpt from an old article on CR relating to humans

“Speaking of humans,” Fontana added, “if you are lean because you are exercising, of course you are doing good, because you’re preventing types of diabetes, some kinds of cardiovascular disease and maybe some types of cancers. But the data suggest that calorie restriction is more powerful. And the people on C.R. are more powerfully protected from diseases than the exercisers.”

Fontana connected his point to his continuing observations of some Calorie Restriction Society members. “In terms of cardiovascular diseases — the No. 1 cause of death; 4 out of 10 people die of it in the U.S. and Europe — we know that they will not die of cardiovascular death,” Fontana said. His subjects have cholesterol around 160, blood pressure around 100 over 60, high HDL, low triglycerides and very low levels of inflammation. “So these people won’t develop these diseases,” he said. “And I think that’s an important finding. Because every day doctors are publishing hundreds of papers on circulation research and medications that are lowering blood pressure or cholesterol by a small bit. And here we have such a powerful intervention that is basically cleaning out the arteries.” At Tufts, Susan Roberts, the lead investigator, echoed this position, saying that the study will probably have greater effects than the average clinical trial. “I don’t know why anyone would take drugs when they could do something like this,” Roberts said, referring to Calerie.-link

A nice article regarding CR in humans, this is only a small interesting bit.

On degrees of CR viable in longer lived animals

My next interview was so upsetting that it is difficult to write about, and it shows that CR can, in certain cases, lead to full-blown anorexia. I called Al at home; his voice was quiet and somewhat difficult to hear. I asked how many calories a day he ate (1,950, he said) and how much he weighed.
"Ninety-two," he answered. I hoped I'd heard wrong. "How tall are you?" I asked. "Five-four," he said. "But I used to be 5-feet-11." He paused. "Osteoporosis." His spine had compressed a full 7 inches—or perhaps he was bent over. I was glad we were on the phone and I couldn't see him.
Al, who is 59, said he began CR in 1989 after reading about it in a textbook co-written by CR guru Roy Walford. -link

It is likely that the CR performed here was more extreme and has now become more moderate.  Such examples suggest that extreme CR might not be recommendable for longer lived animals prone to bone loss over time.    
More moderate CR, combined with CR mimetics should be viable and not entail such side effects(adequate calcium intake and vitamin k2 should probably also be helpful).   Several CR mimetics are said to not be additive with maximal CR(around 65% restriction), but should likely have additive effect on more moderate CR.    An interesting compound that should hopefully be tested in mammals, is rhodiola, which is a compound that is additive with CR and even maximal CR in a species of insect.   The mechanisms of rhodiola are also of interest seeing as it can move some species' lifespan beyond maximal CR

nice global ilumination vid ue4