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).
While the relationships between seizure activity, oxidative stress and neuronal injury have yet to be clarified, previous studies have indicated that defects in antioxidant systems may contribute to seizure genesis and epileptogenesis (Cock, 2002; Patel, 2004; Liang & Patel, 2006; Shin et al, 2008). Earlier, the effects of a KD on mitochondrial ROS generation were discussed. Are there other mechanisms through which oxidative stress can be attenuated in epileptic brain?
So the question remains, can the KD be packaged into a pill? At this stage, given our state of knowledge, the likely answer is NO. Then, could we take a polypharmacy approach and develop a number of pills, each with a distinct mechanistic target? Such a strategy would not be too different than what is practiced by adults – and especially, the elderly – who are by both necessity and choice on multi-drug regimens and/or multi-nutritional supplements, again with the goal of achieving health and warding off the ravages of aging and disease. There is likely no “magic bullet” that completely mirrors the anticonvulsant (and potential neuroprotective) effects of the KD; the same could be said for the treatment of the epilepsies – a group of related conditions with widely divergent etiologies, and hence a multiplicity of underlying pathophysiological mechanisms. Nevertheless, without dissecting the component pieces of the complex metabolic puzzle posed by the KD, we would again be left with only empiric observations, and to wonder curiously how a high-fat diet can exert such profound clinical effects.
Berapa banyak xylitol berbahaya bagi anjing
Munculnya beragam jenis diet bisa bikin bingung. Berbagai manfaat dari setiap diet terdengar sangat menggoda, apalagi dengan klaim “efektif menurunkan berat badan”. Namun, jangan asal diet! Cari tahu dulu dengan jelas mengenai diet yang akan Anda jalani. Pastikan apakah sesuai dan aman untuk Anda. Salah satu jenis diet yang sedang banyak digemari yaitu diet keto. Diet keto adalah salah satu pola makan yang dianggap ampuh menurunkan berat badan secara cepat dan efektif.
Apakah tomat karbohidrat rendah
Diet keto yang ditargetkan sangat populer di kalangan atlet dan individu aktif yang menjalani gaya hidup keto tetapi membutuhkan lebih banyak karbohidrat. Ini membagikan tambahan 20-30 gram karbohidrat segera sebelum dan sesudah latihan untuk memungkinkan latihan dengan intensitas yang lebih tinggi dan peningkatan pemulihan. (Jumlah karbohidrat total mencapai 70-80 gram per hari.) Pilihan terbaik termasuk buah, susu atau makanan berbasis biji-bijian, atau produk nutrisi olahraga. Karena karbohidrat tambahan siap dibakar, mereka tidak akan disimpan sebagai lemak tubuh.
In most instances, we eat because its meal time or it has been several hours since we last ate. Some experts recommend eating when you are hungry, stop when you are already full, and simply enjoy every mouthful. However, for you to get to that desired ‘keto’ state, you must keep track and count carbs and calories in order to get the hang of what is in your food and what you are putting into your body. So without further ado, here are five keto diet apps that will help you monitor your progress and discover new delectable recipes.