As described throughout the previous sections, there are many instances of codependencies and feed-forward loops in bioenergetic and antioxidant signal transduction, which supports the well-known potential for metabolic stimuli, such as diet or exercise, to have a profound physiological influence. Given the central role of mitochondria in oxidative phosphorylation and ROS production, the overlap between bioenergetic and antioxidant signaling is not surprising and is possibly an outcome of evolution favoring efficiency. PGC-1α is at the center of this overlapping and complex network of codependencies. The likely role of PGC-1α as a coactivator of FOXO3a indicates a possible dependence of FOXO3a transcriptional activity on PGC-1α [287], indicating FOXO3a as a central mediator as well. Furthermore, FOXO3a induces transcription of PGC-1α [287, 322, 367], and formation and antioxidant transcriptional activity of the PGC-1α-FOXO3a complex are partly dependent on interaction with SIRT1 [325]. In muscle, expression of many of the bioenergetic and antioxidant proteins previously discussed is dependent on PGC-1α [265]. Upstream, activation of PGC-1α is dependent on AMPK [242] and SIRT1 [242, 269] and partly dependent on SIRT3 [270]. Furthermore, activation of SIRT1 is dependent on AMPK [242], which may also be the case for SIRT3. AMPK and PGC-1α are therefore two key factors, with critical supporting roles of the sirtuins, in the signal transduction linking bioenergetics to antioxidant defense. Further supporting the relevance of this linkage to nutritional ketosis, expression of AMPK, SIRT1, FOXO3a, and NFE2L2 is required for extension of lifespan in C. elegans by exogenous BHB [95], and expression of AMPK, p38 MAPK, and NFE2L2 is required for the extension of lifespan, also in C. elegans, by mitohormesis induced through inhibition of glucose metabolism [73]. The induction of AMPK [259, 260], SIRT3 [263, 329], p38 MAPK [310–313], PGC-1α [76, 77, 260, 282, 283], FOXO3a [324, 331, 333], and NFE2L2 [358–360] activity by oxidative stress also makes this signaling highly relevant to mitohormesis [263, 282, 360], especially given that activation of these proteins has been shown to decrease mitochondrial or cellular ROS [76, 263, 282, 289, 323, 332, 334, 356, 359, 367]. Furthermore, mitochondrial biogenesis [346] and the activities of AMPK [259, 260], SIRT3 [329], p38 MAPK [311, 312], PGC-1α [76, 77, 260, 283], FOXO3a [324], and NFE2L2 [368] are increased by H2O2, more specifically associating this signaling with mitohormesis. Given that AMPK and sirtuins are upstream of the majority of this signaling and that AMPK and sirtuin activities are stimulated by both bioenergetic and oxidative stressors, these stressors are likely the primary signals through which nutritional ketosis may induce the mitochondrial and antioxidant adaptations characteristic of mitohormesis (Figure 2).
Too much fat at the waist . Although obesity in general raises your risk of metabolic syndrome, excess belly fat (being “apple-shaped”) is the riskiest kind of fat, defined as more than 40 inches around the waist for men, or more than 35 inches for women. Ask your doctor about different measurements for your ethnicity, Ndumele says. “Individuals of Asian descent are thought to have an increased risk at a lower threshold of belly fat, for example.”
This “lazy” keto bread recipe is anything but boring: Crumbling the butter directly into the dough creates moist and tender biscuits for all your sweet and savory recipes. Plus, this recipe takes 30 minutes from start to finish and keeps each biscuit macro-friendly at 3 net carbs. Stay more Bulletproof and use the sour cream and whey protein swaps suggested in the recipe, plus avoid eating flaxseed too often.
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The 2 major issues that will lead to a flat loaf is not whipping the egg whites and gently folding them in OR using almond meal instead of a finely ground almond flour. If you've tried everything and they don't seem to be working for you, the next best option will be to make a larger recipe. Try making 1.5x this recipe (it's easy to do using the servings slide bar) and you'll have a much larger loaf.
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