kött och dess hormonella verkan

[Wilson]

vad är det i kött som gör att testosteronet ökar i kroppen?

[Sverker]

Ingenting:confused:

Finns absolut inget i kött som höjer testtosteronnivån.

[King Grub]

Postprandial changes in sex hormones after meals of different composition.

Habito RC, Ball MJ.

School of Biomedical Sciences, University of Tasmania, Launcastor, Australia.

The postprandial effects of different meals on serum testosterone, serum sex hormone-binding globulin (SHBG), and free androgen index were sequentially evaluated in 15 healthy men. The isocaloric meals contained different proteins and different quantities and type of fat as a mixed meal. Four test meals were given to subjects in random order: a lean meat meal, a tofu meal (both containing approximately 20% energy from fat), and meat meals with added animal fat or safflower oil (both 54% energy from fat). Blood samples were obtained at baseline and at 2, 3, and 6 hours after each meal. There was a significant decrease in testosterone and free androgen index after both tofu and lean meat meals. The 2-hour serum testosterone and the decremental area under the curve were significantly more negative after the lean meat meal than the meat meal with added animal fat. The testosterone area under the curve was least for the high animal fat meal indicating little change from baseline. As men are postprandial for a significant proportion of the day, the lower sex hormone values after a low animal fat meal may provide long-term benefits in reducing the risk of diseases, such as prostate cancer, which appear to be sex hormone-dependent.

[King Grub]

Metabolism. 1990 Sep;39(9):943-6.

Effects of a fat-containing meal on sex hormones in men.

Meikle AW, Stringham JD, Woodward MG, McMurry MP.

Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City.

The effect of a fat-containing meal on plasma sex steroid concentrations was investigated in normal men. After an overnight fast on two separate occasions, subjects ingested a liquid meal containing either a nonnutritive sweetener (control), or isocaloric meals of mixed calorie sources with either high-fat content or mixed carbohydrate and protein with minimal fat. The order of the meals was alternated. Blood samples were collected at 15-minute intervals and pooled each hour. Sampling began at 7:00 AM and the test meal was ingested at 8:00 AM. Sex steroids, including estrone, estradiol, testosterone, and dihydrotestosterone (DHT), sex hormone-binding globulin (SHBG) capacity, free testosterone concentration, and luteinizing hormone (LH) were determined by either specific radioimmunoassay or dialysis. The fat-containing meal, but not the nonnutritive or mixed carbohydrate and protein meal, resulted in a significant (P less than .01) reduction in total and free testosterone. Estrogens and luteinizing hormone were unaffected by either meal. This is the first documentation, to our knowledge, of the acute effect of a fat-containing meal on sex steroid concentrations in blood. Our observations suggest that a fat-containing meal reduces testosterone concentrations without affecting luteinizing hormone. This might indicate that fatty acids modulate testosterone production by the testes.

[Wilson]

Jag hade bara för mig att kött höjde testot :confused: har hört här sagt "en biff innan sängdags är bra eftersom det höjer testot"...

Enligt de studierna ska alltså animaliskt fett MINSKA testo-produktionen? har jag förstått studierna rätt?
jag är inte så vansinnigt duktig på engelska...

[King Grub]

Originally posted by Wilson
Jag hade bara för mig att kött höjde testot :confused: har hört här sagt "en biff innan sängdags är bra eftersom det höjer testot"...

Enligt de studierna ska alltså animaliskt fett MINSKA testo-produktionen? har jag förstått studierna rätt?
jag är inte så vansinnigt duktig på engelska...

Nja, lean meat, fettsnålt kött, minskade testoproduktionen. Men i princip så verkar det stämma.

[King Grub]

Effects of an omnivorous diet compared with a lactoovovegetarian diet on resistance-training-induced changes in body composition and skeletal muscle in older men

Wayne W Campbell, Marvin L Barton, Jr, Deanna Cyr-Campbell, Stephanie L Davey, John L Beard, Gianni Parise and William J Evans

From the Nutrition, Metabolism, and Exercise Laboratory, Donald W Reynolds Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock; the Geriatric Research, Education, and Clinical Center, Central Arkansas Veterans Healthcare System, Little Rock; the Noll Physiological Research Center and the Department of Nutrition, The Pennsylvania State University, University Park; and the Department of Kinesiology, McMaster University, Hamilton, Canada.


Background: Very limited data suggest that meat consumption by older people may promote skeletal muscle hypertrophy in response to resistance training (RT).

Objective: The objective of this study was to assess whether the consumption of an omnivorous (meat-containing) diet would influence RT-induced changes in whole-body composition and skeletal muscle size in older men compared with a lactoovovegetarian (LOV) (meat-free) diet.

Design: Nineteen men aged 51–69 y participated in the study. During a 12-wk period of RT, 9 men consumed their habitual omnivorous diets, which provided 50% of total dietary protein from meat sources (beef, poultry, pork, and fish) (mixed-diet group). Another 10 men were counseled to self-select an LOV diet (LOV-diet group).

Results: Maximal strength of the upper- and lower-body muscle groups that were exercised during RT increased by 10–38% (P < 0.001), independent of diet. The RT-induced changes in whole-body composition and skeletal muscle size differed significantly between the mixed- and LOV-diet groups (time-by-group interactions, P < 0.05). With RT, whole-body density, fat-free mass, and whole-body muscle mass increased in the mixed diet group but decreased in the LOV- diet group. Type II muscle fiber area of the vastus lateralis muscle increased with RT for all men combined (P < 0.01), and the increase tended to be greater in the mixed-diet group (16.2 ± 4.4 %) than in the LOV diet group (7.3 ± 5.1%). Type I fiber area was unchanged with RT in both diet groups.

Conclusion: Consumption of a meat-containing diet contributed to greater gains in fat-free mass and skeletal muscle mass with RT in older men than did an LOV diet.

[Wilson]

Men den studien verkade ju inte tyda på att hormonerna höjdes i samband med intag av kött?
Det kan väl lika bra vara proteinkvalitén som gjorde att de köttätande la på sig mer muskler än vegetarianerna?

[King Grub]

Originally posted by Wilson
Men den studien verkade ju inte tyda på att hormonerna höjdes i samband med intag av kött?
Det kan väl lika bra vara proteinkvalitén som gjorde att de köttätande la på sig mer muskler än vegetarianerna?

Japp. Den lade jag in bara för att visa att köttätande bygger muskler mer än vad en vegetarisk diet gör; så det inte finns någon anledning att spola biffarna bara för att de inte höjer testot.

[Metal_boy_]

biff e gott men variation är nog bäst

[Veggie]

I studien så ökades energiintaget hos köttätarna, deras proteinintag var också högre. Hos LOV-gruppen minskades energiintaget och proteinintaget var lägre. Kan detta ha inverkat måntro :)

Säger inte att studien är helt ute och cyklar men vissa brister verkar ju klart finnas.

För att återgå till ämnet...

Serum sex hormones and endurance performance after a lacto-ovo vegetarian and a mixed diet.

Raben A, Kiens B, Richter EA, Rasmussen LB, Svenstrup B, Micic S, Bennett P.

August Krogh Institute, University of Copenhagen, Denmark.

Serum sex hormones and endurance performance after a lacto-ovo vegetarian and a mixed diet. Med. Sci. Sports Exerc., Vol. 24, No. 11, pp. 1290-1297, 1992. The effect of a lacto-ovo vegetarian (V) and a mixed, meat-rich (M) diet on the level of serum sex hormones, gonadotropins, and endurance performance of eight male endurance athletes was investigated in a 2 x 6 wk cross-over study. The energy contribution from carbohydrate, fat, and protein was 58%, 27%, and 15% on the V diet and 58%, 28%, and 14 E% on the M diet. For total fasting serum testosterone (T) there was a significant interaction between diet and time (P < 0.01). Thus, the V diet resulted in a lower total T level (13.7, 9.8-32.4 nmol.l-1) (median and range) compared with the M diet (17.4, 11.8-33.5 nmol.l-1). During exercise after 6 wk on the diets total T was also significantly lower on the V than on the M diet (P < 0.05). Serum free testosterone, however, did not differ significantly during the 6 wk dietary intervention periods and neither did serum concentrations of sex hormone binding globulin, dihydrotestosterone, dehydroepiandrosterone sulphate, 4-androstenedione, estrone, estradiol, estrone sulphate, or gonadotropins. Endurance performance time was higher for six and lower for two after the mixed diet compared with the vegetarian diet. This was not significant, however. In conclusion, 6 wk on a lacto-ovo vegetarian diet caused a minor decrease in total testosterone and no significant changes in physical performance in male endurance athletes compared with 6 wk on a mixed, meatrich diet.

Fann den tyvärr inte i fulltext så energiintaget och övrig info om kosten blir en gåta...

//Veggie

[z_bumbi]

Måste bara.

Serum sex hormones and endurance performance after a lacto-ovo vegetarian and a mixed diet.

Vad är en lactoovo-diet om den inte är mixad?
Vad är en mixad diet överhuvudtaget?

Bara ordvalet i titeln ger mig utslag, studien som sådan må vara hur bra som helst (Har inte läst den.) men rubriken är hemsk.

[Wilson]

även ifall kött höjer testot eller ej, tycker jag kött är rätt billigt med tanke på hur god mat man får för sina pengar.

Min favorit är benfri högrev av nöt (har jag för mig att det heter). på ICA i min stad kostar det ca 30-40 kr för 700-800 gr...

efter en tid i ugnen är det riktigt gott! :eating:

[karrl]

Har kidney -och sojabönor sänkade effekt?

[King Grub]

Sojabönor innehåller fytoöstrogener, vilka kan ge östrogena effekter, men i praktiken agerar de snarare besparande på det kroppsegna testosteronet.