Ihmiset lihovat koska syövät liian usein ?
Välipalat ja 3 tunnin välein syöminen on uuden Naturessa julkaistun tutkimuksen mukaan huono idea:
[list:hzmnb5nt]The researchers present their findings in the current issue of the journal Nature.
Hunger makes you active
The key switch player in this is a transcription factor called Foxa2. Transcription factors are proteins that make sure other genes are activated and converted into proteins. Foxa2 is found in the liver, where it influences fatburning, but also in two important neuron populations in the hypothalamus -- the region of the brain that controls the daily rhythm, sleep, intake of food and sexual behavior. The control element for Foxa2 activity is insulin, in both the liver and the hypothalamus.
If a person or animal ingests food, the beta cells in the pancreas release insulin, which blocks Foxa2. When fasting, there is a lack of insulin and Foxa2 is active. In the brain, the scientists have discovered, Foxa2 assists the formation of two proteins: MCH and orexin. These two brain messenger substances trigger different behavior patterns: the intake of food and spontaneous movement. If mammals are hungry, they are more alert and physically active. In short, they hunt and look for food. "If you watch a cat or a dog before feeding it, you can see this very clearly," says Stoffel.
Explanation found for lack of movement
The researchers discovered a disorder in obese mice: in these animals, Foxa2 is permanently active, regardless of whether the animals are fasting or full. This explains a well-known but until now unaccountable phenomenon: the lack of movement in obese people and animals.
To prove this, the researchers used a genetic trick to breed mice, in the brains of which Foxa2 is always active, regardless of whether they have just eaten or are fasting. These mice produce more MCH and orexin and move five times more than normal animals, in which insulin deactivates Foxa2 after eating or which are obese. The genetically modified mice lose fatty tissue and form larger muscles. Their sugar and fat metabolism works flat out and their blood values are considerably improved.
http://www.sciencedaily.com/releases/20 ... 184138.htm[/list:u:hzmnb5nt]
Insuliinin rooli alkaa aueta yhä enemmän painonhallinnassa.
Tarinan opetus: syöt harvemmin, niin haluat liikkua enemmän.
Pretending to be certain about propositions for which no evidence is even conceivable—is both an intellectual and a moral failing. —Sam Harris