Tillskott av Vitamin C ökar fettförbränning

[L-Sami]

En studie hittat i Muscle&Fitness #August 06 av PhD Jim Stoppani
Kanske intresserar någon

At the end 2006 Experimental Biology conference in San Francisco, researches reported that Vitamin C levels in the body (measured in the blood) were correlated with bodyfat and fat oxidation. They placed 20 obese men and women on a low-fat diet that provided 67% of the U.S recommended daily allowance (RDA) of Vitamin C for four weeks, Half of the subjects were also given 500mg of Vitamin C, while the other half received a placebo. Interestingly, the scientists discoverd that at the start of the study, volunteers with the lowest blood levels of Vitamin C were to have the highest amount of bodyfat. After four weeks, the subjects that were provided Vitamin C had increased its levels in their blood by 30%, while the placebo group's blood levels had decreased by 27%. Although both groups lost about 9 pounds of total bodyweight, the group that supplemented with Vitamin C lost more bodyfat. As the placebo group's Vitamin C levels fell, so did their ability to oxidize fat- a decrease of up to 10%

Frågan är ju hur mycket de förlorade kroppsfett som fick C-Vitamin, men ändå verkar C-Vitamin vara nåt att ha i sitt skafferi om man deffar.

Muscle&Fitness August 2006 s. 240

[L-Sami]

forts.
The scientists believe that the mechanism behind the vitamin C affect on fat oxidation is linked to the essential role the vitamin plays in the synthesis of carnitine. Carnitine is an amino acid that's responsible for transporting fatty acids to the machinery in cells that burns them for fuel

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Studien är gjord på 20 personer.

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Strategies for healthy weight loss: from vitamin C to the glycemic response.
J Am Coll Nutr. 2005 Jun;24(3):158-65. Review.

America is experiencing a major obesity epidemic. The ramifications of this epidemic are immense since obesity is associated with chronic metabolic abnormalities such as insulin resistance, dyslipidemia, and heart disease. Reduced physical activity and/or increased energy intakes are important factors in this epidemic. Additionally, a genetic susceptibility to obesity is associated with gene polymorphisms affecting biochemical pathways that regulate fat oxidation, energy expenditure, or energy intake. However, these pathways are also impacted by specific foods and nutrients. Vitamin C status is inversely related to body mass. Individuals with adequate vitamin C status oxidize 30% more fat during a moderate exercise bout than individuals with low vitamin C status; thus, vitamin C depleted individuals may be more resistant to fat mass loss. Food choices can impact post-meal satiety and hunger. High-protein foods promote postprandial thermogenesis and greater satiety as compared to high-carbohydrate, low-fat foods; thus, diet regimens high in protein foods may improve diet compliance and diet effectiveness. Vinegar and peanut ingestion can reduce the glycemic effect of a meal, a phenomenon that has been related to satiety and reduced food consumption. Thus, the effectiveness of regular exercise and a prudent diet for weight loss may be enhanced by attention to specific diet details.

PMID: 15930480 [PubMed - indexed for MEDLINE]

[Krampus]

Studien är gjord på 20 personer.

:D

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Testet på grisarna af Gunea är också ganska gammalt ;)
Jag har alltid trott på C-vitamin..

Effects of a dietary oxidized fat on cholesterol in plasma and lipoproteins and the susceptibility of low-density lipoproteins to lipid peroxidation in guinea pigs fed diets with different concentrations of vitamins E and C.
Int J Vitam Nutr Res. 2004 Jan;74(1):11-20.

To investigate the effect of a dietary oxidized fat on the concentrations of cholesterol in liver, plasma, and lipoproteins and the susceptibility of low-density lipoproteins (LDL) to lipid peroxidation, and to explore the effects of vitamins E and C, male guinea pigs were divided into five groups. Four groups were fed diets with an oxidized fat supplemented with 35 or 175 mg alpha-tocopherol equivalents/kg and 300 or 1000 mg of vitamin C/kg for 29 days. One group, used as a control, was fed the same basal diet with fresh fat with 35 mg alpha-tocopherol equivalents/kg and 300 mg of vitamin C/kg. Guinea pigs fed the oxidized-fat diets, irrespective of dietary vitamin E and C concentrations, had significantly lower concentrations of total cholesterol in the liver and a lower concentration of cholesterol in LDL than the control animals fed the fresh fat. According to the lag time before onset of lipid peroxidation, LDL of guinea pigs fed the oxidized-fat diet with 35 mg alpha-tocopherol equivalents and 300 mg vitamin C/kg were significantly more susceptible to copper-induced lipid peroxidation than those of guinea pigs fed the fresh fat diet. Within the groups fed the oxidized fat diets, increasing the dietary vitamin E concentration from 35 to 175 mg/kg significantly (p < 0.05) and increasing the dietary vitamin C concentration from 300 to 1000 mg/kg in tendency (p < 0.10) reduced the susceptibility of LDL to oxidation. LDL of guinea pigs fed the oxidized fat diets with 175 mg alpha-tocopherol equivalents/kg were even more resistant to oxidation than LDL of guinea pigs fed the fresh diet. In conclusion, the study shows that dietary oxidized fat influences the cholesterol metabolism and the susceptibility of LDL to lipid peroxidation; the latter can be modified by dietary vitamins E and C.
PMID: 15060896 [PubMed - indexed for MEDLINE]

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:D

Jag vet att du hoppades på att jag sa det där av ren jobbighet :D..men i själva verket var det för att styra av din kommande kommentar. ( Because I like Vitamin C :love: )

[Doctor Snuggles]

Den säger dock bara ngt om man inte får i sig dagsbehovet. De har inte testat med flera olika doser utöver dagsbehovet.

[Krampus]

Jag vet att du hoppades på att jag sa det där av ren jobbighet :D..men i själva verket var det för att styra av din kommande kommentar. ( Because I like Vitamin C :love: )
Åh, du är så omtänksam! :love:

[L-Sami]

Bra! Fler studier. Vad spelar det för roll om studien var gammal? Jag såg den första gången idag och jag blev intresserad. Finns säkert andra som inte är medvetna om det med C-Vitamin och fettförbränning. Det har i allafall inte tagits upp på kollo tidigare vad jag ser. Det är trots allt en träningsforum och man ska tipsa varandra om olika saker för att förbättra sin träning. Sen möter man såna som kör med bara ironi. Ni saknar träningens etik och fair play. *screwy*

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Den säger dock bara ngt om man inte får i sig dagsbehovet. De har inte testat med flera olika doser utöver dagsbehovet.

De som fick mest positiv effekt hade ett tillskott på 500mg/dag+67% av RDI (USA RDI 60mg*0.67=cirka 40mg) vilket är i runda slängar 480mg mer än dagsbehovet och "ja" de som fick försämrad effekt intog endast 67% av RDI. Men ditt uttalande blir felaktigt då du inte vet om de 20mg C-vitamin som saknades hos ena gruppen innebar hela den försämrade förbränningen eller om det var överskottet hos den andra gruppen som gav den positiva effekten. Överskottsgruppen hade hur som helst bäst resultat.

Det som saknas i studien är en grupp liggandes på RDI exakt för att få skillnaden mellan denna och 500mg-gruppen.

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Bra! Fler studier. Vad spelar det för roll om studien var gammal?

Jag sa inte att studien du tog upp var gammal utan att grisstudien "också" var gammal såsom den första jag postade. Ursäkta om det kunde misstolkas.