I have heard one can get the same effects from taking Leucine alone as from taking all 3 BCAA, is this true?
Due to leucine’s metabolic properties, many people focus solely on leucine and not the other two BCAAs, valine and isoleucine. Research has shown that leucine-rich diets or administration of leucine alone lead to decreases in valine and isoleucine plasma concentrations and a BCAA imbalance (Shirmomura et al., 2004). While it may be cheaper to supplement with leucine alone instead of all three BCAA, one should supplement with all three BCAA so not to create a BCAA imbalance. Isoleucine and Valine also has some interesting properties of their own, separate from leucine. Isoleucine has been shown to increase glucose intake via PI3K activation, one of the same pathways leucine uses, but independently of the mTOR pathway (Doi et al., 2003). Valine has been shown to reduce fatty acid synthase in adipocytes by 40%, which will lead to less fat storage (Taylor & Halperin, 1975).
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