One highly studied mechanism implicated in the clinical benefits of calorie restriction involves sirtuins, a large and diverse family of enzymes that regulate gene expression. The first sirtuin, silent information regulator 2 (Sir2), was described in yeast. Sir2 is a class III histone deacetylase that uses the cofactor nicotinamide adenine dinucleotide (NAD+) in a catalytic reaction that releases nicotinamide (a feedback inhibitor) and O-acetyl ADP ribose (Imai et al. 2000; Marmorstein 2004; Sauve et al. 2006). It has been reported that increased Sir2 activity lengthens life span, and that calorie restriction increases Sir2 levels and does not promote longevity in SIR2 knockouts (Kaeberlein et al. 1999; Lin et al. 2000, 2004; Tissenbaum and Guarente 2001; Rogina and Helfand 2004). In mammals, calorie restriction increases the expression of Sirt1, the Sir2 mammalian ortholog, in various tissues, including brain. Resveratrol, a natural Sirt1 activator found in red wine, lengthens the life span of mice and prevents the age-related deterioration of their motor function (Cohen et al. 2004; Baur et al. 2006). Additionally, resveratrol stimulates AMP kinase activity in neurons (Dasgupta & Milbrandt, 2007), and more importantly, protects against kainic acid-induced seizures and oxidative stress in rats (Gupta et al., 2002).
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Jo is the creative food photographer and stylist behind healthy eating blog, Modern Food Stories. Jo's a testament that once you find the right approach for you, you can overcome poor health through the healing power of food. She believes the secret to radiant health starts and ends with a healthy gut so all her recipes are grain, gluten and refined sugar free. Most are also dairy-free.
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Keto Pills—what are they and should you buy them? Great questions! Today we are looking at this supplement, which manufacturers claim can help you lose weight, burn fat, and increase energy. We will analyze these claims and discuss the process of weight loss that is too often overwrought with confusing and conflicting theories. Do you need to drop a lot of weight? Do you need to drop just a few pounds to get your ideal body? These are endeavors we undertake as summer approaches, but what are the best ways to get that hot body you’ve always wanted? Whether you are headed for a beach vacation or you want to get in better shape for health reasons, this article should be helpful!
Baur JA, Pearson KJ, Price NL, Jamieson HA, Lerin C, Kalra A, Prabhu VV, Allard JS, Lopez-Lluch G, Lewis K, Pistell PJ, Poosala S, Becker KG, Boss O, Gwinn D, Wang M, Ramaswamy S, Fishbein KW, Spencer RG, Lakatta EG, Le Couteur D, Shaw RJ, Navas P, Puigserver P, Ingram DK, de Cabo R, Sinclair DA. Resveratrol improves health and survival of mice on a high-calorie diet. Nature. 2006;444:337–342. [PMC free article] [PubMed] [Google Scholar]
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What investigators have elucidated over the past decade or so is that a variety of molecular, genetic, cellular, and metabolic factors are likely contributory to the clinical effects of the KD. As a generalization, it is becoming widely accepted that the mechanistic underpinnings of the KD are likely multiple, parallel, and possibly synergistic (Bough & Rho, 2007).