Alarming study/ Microplastics are detected in the meat, milk and blood of animals
The quality of the food we eat is a topic on which a l...

A new study has found that exposure to sunlight stimulates the release of a hunger hormone from the skin, but the effects are only prevalent in men. Researchers from Tel Aviv University in Israel claim that men are more likely to gain weight during the summer because of this hormone.
However, in women, the sex hormone estrogen interferes with the release of this hunger hormone, meaning it does not lead to a change in appetite. The need to consume food is largely controlled by communication between peripheral tissues, such as the gut and liver, and the brain.
Hormonet lirohen nga organet periferike për të arritur në rajonet e trurit si hipotalamusi, i cili kontrollon funksione si temperatura dhe gjumi, si dhe uria.
Studimi, i botuar sot në Nature Metabolism , shikoi rezultatet e një sondazhi me 3000 pjesëmarrës izraelitë të cilët regjistruan dietën e tyre midis 1999 dhe 2001.
Carmit Levy dhe ekipi i saj panë se, mesatarisht, burrat rritën marrjen e kalorive nga ushqimi në muajt e verës, kur rrezatimi diellor është më i lartë.
Megjithatë, gratë nuk treguan një kulm të ngjashëm veror. Hulumtimi u mbështet nga një studim i minjve që u ekspozuan ndaj rrezatimit ditor ultravjollcë (UVB) për dhjetë javë.
Studiuesit vëzhguan një 'rritje të konsiderueshme në marrjen e ushqimit' me minjtë meshkuj, por jo te femrat.
U zbulua se rrezatimi UVB stimuloi lirimin e hormonit të urisë ghrelin nga qelizat yndyrore në indin e lëkurës së minjve meshkuj, të quajtur adipocitet.
Me arritjen në hipotalamus, grelina rriti oreksin tek këta minj meshkuj, duke nxitur marrjen e ushqimit dhe shtimin e peshës. Studiuesit vunë në dukje gjithashtu se minjtë treguan sjellje të rritur të kërkimit të ushqimit, duke sugjeruar se rritja e marrjes së ushqimit lidhej gjithashtu me vetitë shpërblyese të ushqimit dhe jo vetëm me përmbushjen e kërkesave për energji.
Megjithatë, ky efekt u zbut te minjtë femra sepse hormoni seksual estrogjen ndërhynte në çlirimin e grelinës nga qelizat dhjamore brenda lëkurës. Minjtë femra me estrogjen me qarkullim të ulët gjithashtu shfaqën konsum më të lartë të ushqimit kur ekspozoheshin ndaj UVB.
The researchers conducted three more experiments, two of which looked at human cell cultures in the lab and their response to UVB radiation. They found that male human skin samples exposed to UVB for five days led to increased ghrelin expression.
Another experiment studied the appetite of people with skin disorders who were receiving UVB therapy. Men generally reported feeling hungrier a month after starting their treatment, but women did not report a change in their appetite.
The researchers believe their results identify skin fat as a potential regulator of feeding behavior, adding a new type of adipose tissue to the energy balance equation.
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