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the final word on SOY PROTEIN??? Good or bad?
- Thread starter AAP
- Start date
psychedout
New member
As to my knowledge, yes it increases estrogen. Personally, I would stay away.
ProteinFiend
New member
they are phytoestrogens... thus they act competitively with estrogen for certain receptors... they give a "mini-tamoxifen" effect.
A small amount is good imo...Would I make it my main protein source...no way...
I always believe the broader spectrum of protein sources you use the better off you are...
I always believe the broader spectrum of protein sources you use the better off you are...
Sigmund Roid
New member
I am an opponent of soy, but here is something interesting:
Nutrition. 2002 Jun;18(6):490-5. Related Articles, Links
Effects of a soy protein diet on exercise-induced muscle protein catabolism in rats.
Nikawa T, Ikemoto M, Sakai T, Kano M, Kitano T, Kawahara T, Teshima S, Rokutan K, Kishi K.
Department of Nutrition, School of Medicine, The University of Tokushima, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan. [email protected]
OBJECTIVE: We examined effects of dietary soy protein isolate on muscle calpain activity and myosin heavy chain (MHC) degradation in rats performing an acute running exercise. METHODS: In rats fed a 20% casein diet, the treadmill running exercise, fixed at 80 kg/m, transiently increased calpain activity in gastrocnemius muscles in parallel with the release of creatine kinase into plasma. The fixed running also caused an accumulation of immunoreactive degradation fragments of MHC in the muscle. Feeding a 20% soy protein isolate diet as opposed to the control casein diet to rats significantly suppressed the running-induced activation of mu- and m-calpains, fragmentation of MHC, and release of creatine kinase into plasma (P < 0.05). RESULTS: Rats fed the soy protein isolate diet had significantly higher calpastatin activity in gastrocnemius muscle than did rats fed the casein diet (P < 0.05), indicating that this increase inhibits the exercise-induced autoactivation of calpain. Activities of proteasome, cathepsin B + L, and antioxidant enzymes and the levels of glutathione and thiobarbituric acid-reactive substances in the muscle did not differ between the diet groups at the end of the exercise. CONCLUSIONS: Our results suggest that diets containing soy protein prevent exercise-induced protein degradation in skeletal muscle, possibly through inhibiting the calpain-mediated proteolysis.
PMID: 12044822 [PubMed - indexed for MEDLINE]
Nutrition. 2002 Jun;18(6):490-5. Related Articles, Links
Effects of a soy protein diet on exercise-induced muscle protein catabolism in rats.
Nikawa T, Ikemoto M, Sakai T, Kano M, Kitano T, Kawahara T, Teshima S, Rokutan K, Kishi K.
Department of Nutrition, School of Medicine, The University of Tokushima, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan. [email protected]
OBJECTIVE: We examined effects of dietary soy protein isolate on muscle calpain activity and myosin heavy chain (MHC) degradation in rats performing an acute running exercise. METHODS: In rats fed a 20% casein diet, the treadmill running exercise, fixed at 80 kg/m, transiently increased calpain activity in gastrocnemius muscles in parallel with the release of creatine kinase into plasma. The fixed running also caused an accumulation of immunoreactive degradation fragments of MHC in the muscle. Feeding a 20% soy protein isolate diet as opposed to the control casein diet to rats significantly suppressed the running-induced activation of mu- and m-calpains, fragmentation of MHC, and release of creatine kinase into plasma (P < 0.05). RESULTS: Rats fed the soy protein isolate diet had significantly higher calpastatin activity in gastrocnemius muscle than did rats fed the casein diet (P < 0.05), indicating that this increase inhibits the exercise-induced autoactivation of calpain. Activities of proteasome, cathepsin B + L, and antioxidant enzymes and the levels of glutathione and thiobarbituric acid-reactive substances in the muscle did not differ between the diet groups at the end of the exercise. CONCLUSIONS: Our results suggest that diets containing soy protein prevent exercise-induced protein degradation in skeletal muscle, possibly through inhibiting the calpain-mediated proteolysis.
PMID: 12044822 [PubMed - indexed for MEDLINE]
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