A new study has confirmed that just looking at the pictures of delicious food is suffice to make one to feel hungry.

As a main regulator, ghrelin controls both eating behavior and the physical processes involved in food metabolism.
These results show that, in addition to the physiological mechanisms for maintaining the body's energy status, environmental factors also have a specific influence on food consumption.
Thus, the pervasive presence of appetizing food in the media could contribute to weight increase in Western populations.
It has long been known that, in addition to the physiological regulatory circuits for the maintenance of a sufficient energy status for the body, external stimuli like smell or the sight of food also influence our feelings of hunger and our resulting eating behavior.
The danger that the exposure to such images will result in the consumption of food that is not needed to maintain the body's energy status is particularly high in our advertising-dominated society.
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They examined the specific physiological reaction of the test subjects to images showing either delicious food or non-edible objects.
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The researchers actually observed that the concentration of grehlin in the blood increases specifically in response to visual stimulation with food images.
"The findings of our study demonstrate, for the first time, that the release of ghrelin into the blood for the regulation of food consumption is also controlled by external factors," Petra Schussler, a scientist at the Max Planck Institute said.
"Our brain thereby processes these visual stimuli, and the physical processes that control our perception of appetite are triggered involuntarily. This mechanism could prompt us to eat a piece of cake just two hours after breakfast," she added.
She thus recommends that individuals with weight problems should preferably avoid looking at images of appetizing food.
Source-ANI