The FOXO family of transcription factors is highly conserved and promotes longevity and resistance to cellular stress. Although there are a variety of FOXO isoforms with varying tissue distribution [318–320], FOXO3a has been the most thoroughly studied in relation to energy sensing, mitochondrial function, and antioxidant defense. Similar to PGC-1α, FOXO3a is activated through phosphorylation by AMPK [321–323] and deacetylation by SIRT1 [324, 325] and SIRT3 [326–329], and its transcriptional activity is at least partly dependent on AMPK [322] and SIRT1 [325]. In a variety of organisms, tissues, and cell types, FOXO3a increases mitochondrial biogenesis and expression of TFAM [329], but is more known for increasing expression of antioxidant and repair proteins, including SOD2 [287, 330, 331], catalase [287, 330, 332, 333], glutathione S-transferase (GST) [322], thioredoxins [287, 323], Prx3 [287, 334], Prx5 [287], and metallothioneins I and II [322], as well as UCP2 [287, 322] and the DNA repair enzyme growth arrest and DNA damage-inducible 45 (GADD45) [322, 324, 335, 336]. FOXO3a is also activated by oxidative stress [324, 331, 333], possibly in a SIRT1-dependent manner [324], and likely mediated through c-Jun N-terminal protein kinase (JNK), which allows FOXOs to translocate to the nucleus by promoting dissociation of 14-3-3 [337, 338]. Furthermore, FOXO3a and SIRT3 interact in mitochondria to induce mitochondrial gene expression in an AMPK-dependent manner [339]. FOXO3a also induces expression of LKB1 [340] and NAMPT [341], indicating a feed-forward cycle of activation with AMPK and sirtuins. Like PGC-1α, FOXO3a transcriptional activity is inhibited by insulin through PKB [331].
Although resting skeletal muscle is less metabolically active than the heart, kidneys, brain, or liver, it rivals even the brain in being the body's most metabolically demanding tissue when considered relative to total tissue mass [369]. Physical activity can greatly increase this demand, making exercise a practical and powerful way to induce bioenergetic adaptations.
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The best part about this bread is that it makes it so much easier to eat a low carb diet. Yes, there are some savage beasts (joking) that don’t miss bread at all and are happy to just eat bacon seven times a day, but if you’re anything like me, bread was a staple of your diet growing up and you still have a look of yearning in your eyes when they drop that bread basket in the middle of the table at family dinner. I feel your pain. This low carb bread recipe is your shoulder to cry on.
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