Grapefruit / citroenen vs. vetverbranding

[Santoz]

M'n zus kwam vandaag weer thuis met een zoveelste makkelijk-afval-fabeltje.
Het misschien welgekende "citroen-dieet"; door middel van 's ochtends een citroen te eten zou je "verbazend snel afvallen".
Ik heb haar dan ook onmiddelijk geantwoord dat er maar 1 hoofdregel voor afvallen bestaat en dat is minder eten dan je verbruikt.
Maar goed, omdat ik wel vaker hoor dat bepaalde tropische fruitsoorten bepaalde enzymen of bestandsmiddelen bevatten die vetverbranding zouden bevorderen en vocht zouden afdrijven zou ik nu wel eens voorgoed willen weten wat hiervan waarheid is, iemand meer info?

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[eric468]

Als je een citroen eet zal je wel afvallen, maar het lijkt me wel zwaar om 24 uur op een citroen te leven

 

[Santoz]

Als je een citroen eet zal je wel afvallen, maar het lijkt me wel zwaar om 24 uur op een citroen te leven

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Ja serieus??

Natuurlijk maar ze denken dan dat ze verder gewoon mogen eten wat ze willen en dat zo'n ding wonderen verricht.

 

[Big'r]

In mijn eigen praktijkervaring heeft het 0 effect gehad maar goed:

Grapefruit may be easy weight loss remedy

29/01/2004 - Eating grapefruit, long recommended by diet programmes for weight loss, may indeed impact the body’s insulin levels, speeding up metabolism and leading to weight loss, say researchers from the US-based Scripps Clinic.

In a 12-week pilot study, led by Dr Ken Fujioka from the clinic's Nutrition and Metabolic Research Center, researchers found that people eating a serving of the citrus fruit with each meal led to an average weight loss of 3.6 pounds.

About 100 male and female participants, who had an average weight of 218 pounds, were divided into three groups. One ate half a grapefruit with each meal, a second was instructed to drink a serving of grapefruit juice three times a day, and a third acted as a control group. The study participants maintained their daily eating habits and slightly enhanced their exercise routine.

Those eating the fruit three times daily lost on average 3.6 pounds over the study period, while those on the juice regime lost 3.3 pounds. The control group only saw an average decrease of 0.5 pounds.

Some of the patients taking grapefruit lost more than 10 pounds, added the researchers.

“For years people have talked about the grapefruit diet, and some even swear by it, but now, we have data that grapefruit helps weight loss,” said Dr Fujioka.

The study also indicates a physiological link between grapefruit and insulin. The researchers speculate that the chemical properties of the fruit reduces insulin, seen in measurements of the participants' glucose levels.

Insulin is known to help regulate fat metabolism and also plays a key role in diabetes. The finding means it could also protect obese people from developing type 2 diabetes. However lowering insulin levels also makes people feel less hungry and this could also explain its link to weight loss.

Grapefruit is already known to affect the metabolism of some drugs, by impacting the enzymes needed to break down common medications.

The researchers are planning a much larger study to see if the results can be confirmed.

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Naringenin inhibits phosphoinositide 3-kinase activity and glucose uptake in 3T3-L1 adipocytes.

Previous studies have shown that flavonoids inhibit glucose uptake in cultured cells. In this report, we show that the grapefruit flavanone naringenin inhibited insulin-stimulated glucose uptake in 3T3-L1 adipocytes in a dose-dependent manner. Naringenin acts by inhibiting the activity of phosphoinositide 3-kinase (PI3K), a key regulator of insulin-induced GLUT4 translocation. Although naringenin did not alter the phosphotyrosine status of the insulin receptor, insulin receptor substrate proteins, or PI3K, it did inhibit the phosphorylation of the downstream signaling molecule Akt. In an in vitro kinase assay, naringenin inhibited PI3K activity. A physiologically attainable dose of 6 microM naringenin reduced insulin-stimulated glucose uptake by approximately 20%. This inhibitory effect remained 24h after the removal of naringenin from the culture medium. Collectively, our findings suggest that the regular consumption of naringenin in grapefruit may exacerbate insulin resistance in susceptible individuals via impaired glucose uptake in adipose tissue.

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Let wel op dat je niet te veel melk zuipt terwijl je grapefruit vreet. De combinatie van oxaalzuur met de calcium + eiwitten in melk kan nierstenen veroorzaken.