Best Source of protein

[Control]

You were given all that as a newborn? You are hardcore. I was given milk and banana mush. :P

When I was a baby I was allergic to milk so they fed me beef hearts. True story.

[Bouncer]

"The biological value of soy protein must be considered inferior to that of casein protein in humans."

As much weight as i've lost by not lifting heavy over the last year, I feel like i've been eating nothing but soy.

Shoulder is good. I'm 2.5 weeks out from surgery, and PT is right on schedule. Won't be 100% for a year, but I can start lifting again in 5 mths.

you should update your thread about your shoulder. let us know what you do in rehab etc..

[Curls4dGirls]

hey curls, replace all your meat sources with soy. get back to us in a month. :P

by the way bro, how is your shoulder?

"The biological value of soy protein must be considered inferior to that of casein protein in humans."

As much weight as i've lost by not lifting heavy over the last year, I feel like i've been eating nothing but soy.

Shoulder is good. I'm 2.5 weeks out from surgery, and PT is right on schedule. Won't be 100% for a year, but I can start lifting again in 5 mths.

[Bouncer]

hey curls, replace all your meat sources with soy. get back to us in a month. :P

by the way bro, how is your shoulder?

[Curls4dGirls]

Casein and soy protein meals differentially affect whole-body and splanchnic protein metabolism in healthy humans.Luiking YC, Deutz NE, Jäkel M, Soeters PB.
Maastricht University, Department of Surgery, Nutrition and Toxicology Research Institute Maastricht (NUTRIM), 6200 MD Maastricht, The Netherlands.

Dietary protein quality is considered to be dependent on the degree and velocity with which protein is digested, absorbed as amino acids, and retained in the gut as newly synthesized protein. Metabolic animal studies suggest that the quality of soy protein is inferior to that of casein protein, but confirmatory studies in humans are lacking. The study objective was to assess the quality of casein and soy protein by comparing their metabolic effects in healthy human subjects. Whole-body protein kinetics, splanchnic leucine extraction, and urea production rates were measured in the postabsorptive state and during 8-h enteral intakes of isonitrogenous [0.42 g protein/(kg body weight . 8 h)] protein-based test meals, which contained either casein (CAPM; n = 12) or soy protein (SOPM; n = 10) in 2 separate groups. Stable isotope techniques were used to study metabolic effects. With enteral food intake, protein metabolism changed from net protein breakdown to net protein synthesis. Net protein synthesis was greater in the CAPM group than in the SOPM group [52 +/- 14 and 17 +/- 14 nmol/(kg fat-free mass (FFM) . min), respectively; P < 0.02]. Urea synthesis rates decreased during consumption of both enteral meals, but the decrease tended to be greater in the subjects that consumed CAPM (P = 0.07). Absolute splanchnic extraction of leucine was higher in the subjects that consumed CAPM [306 +/- 31 nmol/(kg FFM . min)] vs. those that consumed SOPM [235 +/- 29 nmol/(kg FFM . min); P < 0.01]. In conclusion, a significantly larger portion of soy protein is degraded to urea, whereas casein protein likely contributes to splanchnic utilization (probably protein synthesis) to a greater extent. The biological value of soy protein must be considered inferior to that of casein protein in humans.

http://www.ncbi.nlm.nih.gov/pubmed/15867285

[Curls4dGirls]

Effects of replacing meat with soyabean in the diet on sex hormone concentrations in healthy adult males.

Habito RC, Montalto J, Leslie E, Ball MJ.
School of Biological and Chemical Sciences, Deakin University, Melbourne, Australia.

A randomised crossover dietary intervention study was performed to evaluate the effects of replacing meat protein in the diet with a soyabean product, tofu, on blood concentrations of testosterone, dihydrotestosterone, androstanediol glucuronide, oestradiol, sex hormone-binding globulin (SHBG), and the free androgen index (total testosterone concentration/SHBG concentration x 100; FAI). Forty-two healthy adult males aged 35-62 years were studied. Diets were isoenergetic, with either 150 g lean meat or 290 g tofu daily providing an equivalent amount of macronutrients, with only the source of protein differing between the two diets. Each diet lasted for 4 weeks, with a 2-week interval between interventions. Fasting blood samples were taken between 07.00 and 09.30 hours. Urinary excretion of genistein and daidzein was significantly higher after the tofu diet (P < 0.001). Blood concentrations of sex hormones did not differ after the two diets, but the mean testosterone:oestradiol value was 10% higher (P = 0.06) after the meat diet. SHBG was 3% higher (P = 0.07), whereas the FAI was 7% lower (P = 0.06), after the tofu diet compared with the meat diet. There was a significant correlation between the difference in SHBG and testosterone:oestradiol and weight change. Adjusting for weight change revealed SHBG to be 8.8% higher on the tofu diet (mean difference 3 (95% CI 0.7, 5.2) nmol/l; P = 0.01) and testosterone:oestradiol to be significantly lower, P = 0.049). Thus, replacement of meat protein with soyabean protein, as tofu, may have a minor effect on biologically-active sex hormones, which could influence prostate cancer risk. However, other factors or mechanisms may also be responsible for the different incidence rates in men on different diets.

PMID: 11103227 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/pubmed/11103227

[Bouncer]

Are amino acids better than eating a meal?

the question itself is flawed. as if whole food meals didnt have amino acids in it. lmao

[Curls4dGirls]

Background
Evidence suggests an inverse relationship between soy protein intake and serum concentrations of male sex hormones. Anecdotal evidence indicates that these alterations in serum sex hormones may attenuate changes in lean body mass following resistance training. However, little empirical data exists regarding the effects of soy and milk-based proteins on circulating androgens and exercise induced body composition changes.

Methods
For 12 weeks 20 subjects were supplemented with 50 g per day of one of four different protein sources (Soy concentrate; Soy isolate; Soy isolate and whey blend, and Whey blend only) in combination with a resistance-training program. Body composition, testosterone, estradiol and sex hormone binding globulin (SHBG) were measured at baseline and week 12.

Results
Protein supplementation resulted in a significant increase in lean body mass independent of protein source (0.5 ± 1.1 and 0.9 ± 1.4 kg, p = 0.006, p = 0.007). No significant differences were observed between groups for total and free testosterone, SHBG, percentage body fat, BMI or body weight. The Testosterone/Estradiol ratio increased across all groups (+13.4, p = 0.005) and estradiol decreased (p = 0.002). Within group analysis showed significant increases in the Testosterone/Estradiol ratio in soy isolate + whey blend group (+16.3, p = 0.030). Estradiol was significantly lower in the whey blend group (-9.1 ± 8.7 pg/ml, p = 0.033).

Conclusion
This investigation shows that 12 week supplementation with soy protein does not decrease serum testosterone or inhibit lean body mass changes in subjects engaged in a resistance exercise program.

http://www.jissn.com/content/4/1/4

[Curls4dGirls]

Are amino acids better than eating a meal?
Recently, researchers from the University of Texas examined the effects of ingesting a carbohydrate (30 g) and amino acid supplement (15 g of essential amino acids) (CAA) or a meal on protein synthesis. Thirteen men aged 28 to 48 years of age were randomly divided in two tow treatment groups: 1) CAA = 36±10 yrs and 2) Control = 38±8 yr. The CAA and meal were designed to be similar in amino acid content and were administered periodically throughout an 18 hour period. Throughout the day blood and muscle tissue samples were collected in order to assess anabolism. The inclusion of a CAA supplement into a normal diet resulted in a greater anabolic stimulus than the meal treatment as indicated by the ˜25% increase in protein synthesis rate. Additionally, the consumption of only meals throughout the 16 hour study period resulted in a negative net protein balance, while adding frequent CAA supplements resulted in a positive balance. The researchers suggested that the CAA supplement was more effective in maximizing protein synthesis rates as a result of the speed with which the supplement is digested and taken up into the system. Based upon these findings it may be recommended that athletes consume some sort of CAA supplement throughout the day in order to maximize the muscular adaptations to their training regimes and maintain a positive protein balance.

Paddon–Jones D. Sheffield–Moore M, Aarsland A, Wolfe RR, Ferrando AA. (2005). Exogenous amino acids stimulate human muscle anabolism without interfering with the response to mixed meal ingestion. American Journal of Endocrinology and Metabolism, 288:E761– E767.

[Bouncer]

but what if you just subsituted the protein and still ate the other things in your diet. I think its better and more complete than the other proteins.

not really sure what you are trying to say here.

[vicmack777]

Well, what if you just didn't eat meat and used protein shakes/tofu as a substitute for protein, but you ate other foods like greens/carbs. I thought there were vegetarian bodybuildiers out there.

Thanks everyone for the replies. This is more along the lines of what Im talking about. I know that Protein shakes cant be the only source of nutrition, but what if you just subsituted the protein and still ate the other things in your diet. I think its better and more complete than the other proteins.

[OhHannah]

Soylent green is people!

[Bouncer]

Heh heh. Uh, no, it's not made from algae. Or plankton. Google it. Or better yet just have a nice soylent green protein shake. :D

its from some 70's movie. lol

[OhHannah]

isnt that shit made from algae, supposed to have many health benefits

Heh heh. Uh, no, it's not made from algae. Or plankton. Google it. Or better yet just have a nice soylent green protein shake. :D

[Bouncer]

Aww, c'mon, I bet I could find a tasty recipe for it. Maybe a Soylent Green protein shake. :rofl:

isnt that shit made from algae, supposed to have many health benefits