Appetite


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Appetite

 

a pleasant sensation associated with the need for food; also, a physiological mechanism regulating the intake of food substances into the organism. After long deprivation of food, appetite becomes the sensation of hunger.

Appetite is closely related to the activity of the feeding center, primarily those parts of the feeding center located in the hypothalamus and in the cortex of the cerebral hemispheres. Appetite is determined by information coming to the feeding center about nutritive conditions, the intake and assimilation of food, and the consumption of food reserves. Appetite is not caused by the exhaustion of the organism’s food reserves; rather, appetite gives warning beforehand of the exhaustion of food reserves, so that the many stimuli that make up the appetite can change their signals in accordance with a change in the dietary regimen. Stimulation of the appetite depends on the amount of products of intermediary metabolism in the blood, the level of assimilation of these products by the cells, the amount of water in the tissues, the condition of the fat reserves, the contraction of the empty stomach, the lowering of body temperature, and the many external stimuli associated with conditioned reflex activity (the appearance and odor of food, habitual surroundings, and others). Inhibition of the appetite results from eating, distension of the walls of the stomach by food, absorption and assimilation of the products of digestion, and change in the hormonal balance.

General appetite, that is, appetite for any food, is distinguished from specialized or selective forms of appetite which reflect the organism’s need for proteins, fats, carbohydrates, mineral substances, and vitamins. Appetite makes possible the regulation of the need for specific foods in quantities required by the organism. It also promotes the digestion and assimilation of food by stimulating the secretion of saliva and gastric juices. A good appetite is often a sign of physical and mental well-being. Disorders of the appetite are symptomatic of many diseases. A decrease in appetite (anorexia), a pathological increase in appetite (bulimia), or perverted appetite may be found in cases of brain tumors, many nervous and psychological disorders, diseases of the digestive tract, avitaminosis, and endocrine diseases. Normalization of appetite depends on treatment of the basic disease and observance of the proper dietary regimen.

REFERENCES

Anokhin, P. K. “Uzlovye voprosy ν izuchenii vysshei nervnoi deiatel’nosti.” In Problemy vysshei nervnoi deiatel’nosti. Moscow, 1949.
Ugolev, A. M., and V. G. Kassil’. “Fiziologiia appetita.” Uspekhi sovremennoi biologii, 1961, vol. 51, issue 3.
Ugolev, A. M., and V.G. Kassil’. “Pishchevoe povedenie i reguliat-siia gomeostaza.” In Slozhnye formy povedeniia. Moscow-Leningrad, 1965.
Chernigovskii, V. N. Znachenie interotseptivnoi signalizatsii ν pishchevom povedenii zhivotnykh. Moscow-Leningrad, 1962.

V. G. KASSIL’ and A. M. UGOLEV

References in classic literature ?
And once more, when he tried to eat his breakfast, his appetite completely failed him!
Leaving a note for Arthur Barville, on his arrival in Venice, in which he merely mentioned that he had gone to look at the Italian lakes, and that a line addressed to his hotel at Milan would bring him back again, he took the afternoon train to Padua-- and dined with his usual appetite, and slept as well as ever that night.
It became possible for both Colin and Mary to do more of them each time they tried, and such appetites were the results that but for the basket Dickon put down behind the bush each morning when he arrived they would have been lost.
His more tempered appetite was already satisfied, and he faced the new comer with a look of cordiality, that plainly evinced how very opportune he considered his arrival.
I have watched the habits of the animal, young man; and can fearlessly pronounce, by evidence that would be thrown away on ordinary observers, that it is of vast dimensions, inactive, possibly torpid, of voracious appetite, and, as it now appears by the direct testimony of this venerable hunter, ferocious and carnivorous
Very true, I said; and observe the point which I want to understand: Certain of the unnecessary pleasures and appetites I conceive to be unlawful; every one appears to have them, but in some persons they are controlled by the laws and by reason, and the better desires prevail over them-either they are wholly banished or they become few and weak; while in the case of others they are stronger, and there are more of them.
He was supposed from his youth upwards to have been trained under a miserly parent, who encouraged the saving appetites in him, but discountenanced the unnecessary, which aim only at amusement and ornament?
And when his other lusts, amid clouds of incense and perfumes and garlands and wines, and all the pleasures of a dissolute life, now let loose, come buzzing around him, nourishing to the utmost the sting of desire which they implant in his drone-like nature, then at last this lord of the soul, having Madness for the captain of his guard, breaks out into a frenzy: and if he finds in himself any good opinions or appetites in process of formation, and there is in him any sense of shame remaining, to these better principles he puts an end, and casts them forth until he has purged away temperance and brought in madness to the full.
But often, an appetite can come back even when we have eaten enough.
According to previous studies, the most pronounced mild adverse events are insomnia and reduced appetite, with a respective frequency of 90% and 79%.
Phenylalanine is an amino acid produced in the gut when protein is digested and has previously been shown to affect the release of gut hormones that reduce appetite in rodents.
Discuss risk appetite within the appropriate context.