Animals only eat when they are hungry. Orientation for research and consumption of food derived primarily from feeling hungry. This is incentive fungal necessary for survival.
On the other hand, man can eat only when Jaúa- eating in humans also related to psychological factors, social and cultural.
French scientist Brilant Saffarin summed up this matter as follows (1825): “The difference between humans and animals that eat without being hungry and drink without being thirsty.”
Hunger Center and satiety:
Search hunger and satiety mechanisms gained momentum fifty years the -20-century ago, after the great increase in cases of obesity in Western society.
Find organize food on animals such as mice and monkeys conducted mechanisms as well as the restrictions.
Research has shown that the incentive to get the food is controlled by the control of the brain located in Alheiboethelamos Center, a compound of the Hunger Center and satiety.
I’ve found that as a result of injury in a particular area of Alheiboethelamos led this matter that the mice eat a small amount of food and weight decreased. This area has been designated as hunger zone.
While injuring another area of the Alheiboethelamos, this matter resulted in mice that eat nonstop and weight increased. This area has been designated as satiety area.
Hunger and satiety is the works between short periods of time in a long time periods centers. In short periods of time watching these centers food consumption Yumia- when and how much we eat – and also monitors the exchange of materials per day.
Regulate these centers in long periods of time building and consumption of food stores within the body. And thus help to keep your weight and body composition steadfast over the years (as long as the large fluctuations do not occur consumption of food and physical activity)
Factors affecting food consumption:
Scientists did not understand even today fully factors and signals that occupy hunger and satiety centers.
There are many hypotheses, a section of these assumptions contradict each other. But all scientists agree that operation of hunger and satiety centers are not carried out by a single factor, but by a combination of factors, and there is a mutual relationship between these factors.
Among the physiological factors affecting the regulation of food consumption: incentives of the digestive system (nervous and hormonal), level outputs digestion in the blood, for example: the level of glucose in the blood and the state of energy stores.
According to the reference, that “airs” feeling hungry or feeling of fullness, this signal affects: search for food or stop eating.
Different signals responsible for monitoring different periods of time. For example: the level of analysis of food products in the blood and signals that indicate the amount of food in the digestive system, these signals are in the short term while the case of the body stores be long-term.
As mentioned, also psychological and social factors that may affect food consumption such as: boredom, stress, fear, joy and emotion. The effect is different with different people, so that the effect is not always similar when the same person.
Below are some examples of signals that affect food consumption:
1. Neural signals
2. Hyphen signals from the sense organs, in the wake of environmental stimuli
Sight or smell of food, landscape and famous favorite restaurant where people eat in the nearby environment and occupy the hunger center.
3. Signals hyphen from members of the digestive system
When you eat and digest, the walls of the stomach and intestines stretch. In these walls there are sensory cells sensitive to pressure, signals are sent by the nervous system to the control center in Alheiboethelamos. There are translated to the feeling of satiety, which in the aftermath of slow or stop the process of eating.
Foods that need more time to digest remain longer in the stomach, and as a result lead to a feeling of fullness for a longer period.
On the other hand, after emptying the stomach to contract and send a signal to the brain to consume food.