Caffeine yog ib qho stimulant ntuj. Nws muaj nyob rau hauv ntau tshaj 60 nroj tsuag thiab yog nrov heev thoob plaws lub ntiaj teb no. Kas fes, chocolate thiab tshuaj yej peb feem ntau haus muaj caffeine. Nws yuav tsum paub meej tias cov ntsiab lus caffeine hauv cov dej haus sib txawv nrog cov khoom xyaw thiab cov txheej txheem npaj. Txawm hais tias cov kws tshawb fawb ntseeg tias caffeine muaj kev nyab xeeb, kev noj ntau dhau yuav ua rau muaj kev txhawj xeeb.
Nws kwv yees tias 80 feem pua ntawm cov neeg hauv ntiaj teb nyiam haus kas fes txhua hnub. Vim tias nws cov txiaj ntsig zoo rau tib neeg lub cev, cov kws tshawb fawb ntseeg tias caffeine muaj ntau yam txiaj ntsig rau tib neeg kev noj qab haus huv, xws li ua kom muaj kev ceeb toom, txhim kho kev ua kis las thiab mus ob peb vas, thiab txhawb cov metabolism.
Ob lub Tebchaws Meskas Lub Tsev Haujlwm Saib Xyuas Kev Ua Liaj Ua Teb (USDA) thiab European Food Safety Agency (EFSA) txhais tau tias muaj kev noj qab haus huv caffeine tsis pub ntau tshaj 400 mg ib hnub twg, ib zaug noj tsis pub ntau tshaj 200 mg, lossis tsis ntau tshaj 3 mg ib kilogram ntawm lub cev hnyav. .
Tau hais tias, ib qho kev noj ntau dua 500 mg ntawm caffeine yuav ua rau muaj teeb meem. Cov kws tshawb fawb taw qhia tias ntau cov caffeine tuaj yeem ua rau muaj kev ntxhov siab, tsis xis nyob thiab insomnia. Qee qhov kev tshawb fawb tau pom tias txawm tias kev noj caffeine tsis tu ncua hauv cov nyiaj nruab nrab tuaj yeem ua rau mob taub hau thiab mob migraine.
Tsis tas li ntawd, caffeine raug suav hais tias yog hom mob me me, thiab qee tus neeg yuav muaj kev vam khom ntau dua.
Caffeine muaj nyob rau hauv tshuaj yej los yog kas fes, thiab nws cov ntsiab lus txawv heev nyob ntawm seb qhov chaw ntawm lub hauv paus chiv keeb, hom thiab ntau lawm txoj kev.
Feem ntau hais lus, tshuaj yej nplooj muaj 3.5 feem pua caffeine, thaum kas fes taum muaj 1.1 feem pua rau 2.2 feem pua caffeine. Saib nws li no, nws zoo nkaus li tias cov ntsiab lus caffeine hauv tshuaj yej yog siab dua. Txawm li cas los xij, cov txheej txheem ntawm brewing kas fes siv dej kub, uas yuav rho tawm ntau caffeine los ntawm cov taum kas fes. Ntxiv mus, tib neeg siv taum kas fes ntau dua li cov tshuaj yej nplooj thaum lawv haus kas fes. Yog li ntawd, ib khob ntawm brewed aromatic kas fes feem ntau muaj caffeine ntau dua li ib khob tshuaj yej.
Cov tshuaj yej dub, tshuaj yej ntsuab thiab tshuaj yej dawb yog tsim los ntawm cov tshuaj yej tsob ntoo nplooj. Qhov sib txawv ntawm lawv yog lub sijhawm ntawm nplooj khaws thiab qib ntawm oxidation.
Cov nplooj ntawm cov tshuaj yej dub yog oxidized thaum lub sij hawm ua, thaum dawb tshuaj yej thiab ntsuab tshuaj yej tsis yog. Qhov no ua rau cov tshuaj yej dub muaj qhov tshwj xeeb thiab muaj zog tsw, thiab tseem ua rau kas fes ntau dua thaum cov tshuaj yej nplooj yog brewed nrog dej kub.
Ib khob ntawm 237 milliliters ntawm cov tshuaj yej dub muaj qhov nruab nrab ntawm 47 mg ntawm caffeine, tab sis nws kuj tseem muaj li 90 mg ntawm caffeine. Hauv lwm lo lus, kom deb li deb li ib txwm haus 500ml ntawm lub khw muaj kev txhawj xeeb, cov tshuaj yej dub tag nrho yuav muaj txog li 190 mg ntawm caffeine. Hauv qhov sib piv, tib lub khob ntawm 237 milliliters ntawm cov tshuaj yej ntsuab tsuas muaj 20 mus rau 45 milligrams ntawm caffeine, thaum txhua khob tshuaj yej dawb muaj 6 mus rau 60 milligrams caffeine.
Cov ntsiab lus caffeine hauv cov tshuaj yej ntsuab hmoov zoo siab dua, thiab txog 1 gram ntawm hmoov matcha rau txhua ib nrab teaspoon feem ntau muaj 35 mg ntawm caffeine.
Txoj kev brewing muaj txiaj ntsig zoo rau cov ntsiab lus caffeine hauv tshuaj yej. Tshuaj yej nrog lub sij hawm ntev steeping thiab dej kub dua yuav muaj caffeine ntau dua.
Piv txwv li, ib khob ntawm Starbucks Taishu tshuaj yej steeped nyob rau hauv 177 milliliters dej kub rau ib feeb thiab rhuab mus rau 90 mus rau 95 degrees Celsius yuav muaj 40 milligrams ntawm caffeine. Tom qab 3 feeb ntawm soaking, cov ntsiab lus caffeine yuav nce mus rau 59 mg.
Nyob rau hauv sib piv, ntsuab tshuaj yej steeped rau 1 feeb nyob rau hauv tib yam mob muaj 16 mg ntawm caffeine. Tom qab 3 feeb ntawm soaking, tus nqi no ntau dua ob npaug rau 36 mg.
Cov kev tshawb fawb tau pom tias ib khob ntawm 237 milliliters kas fes muaj qhov nruab nrab ntawm 95 milligrams ntawm caffeine. Thiab espresso muaj ntau caffeine. Piv txwv li, Starbucks muaj 58 mg ntawm caffeine hauv 30 ml espresso. Cov dej haus kas fes tshwj xeeb xws li latte thiab cappuccino yog tsim nrog ob lub espresso, thiab ib khob kas fes feem ntau muaj 116 mg ntawm caffeine.
Cov dej kub yuav tso caffeine ntau dua los ntawm cov tshuaj yej, zoo li kas fes. Qhov zoo tshaj plaws brewing kub rau tshuaj yej yog 90 mus rau 96 degree, thaum kas fes brewing teeb meem feem ntau yog siab dua.
Tau kawg, qee tus neeg yuav muab cov kas fes hauv av lim dej txias rau 8 mus rau 24 teev los ua kas fes txias. Tus nqi ntawm kas fes brewed li no yog 1.5 npaug ntawm kas fes brewed nrog cov dej kub zoo tib yam, yog li cov ntsiab lus caffeine hauv cov dej haus yuav siab dua.
Cov nyhuv ntawm caffeine yog ceev heev, feem ntau nyob rau hauv 20 feeb mus rau 1 teev tom qab noj.
Yog tias koj nkag siab rau caffeine, xav txog haus cov tshuaj yej dawb los yog tshuaj ntsuab tshuaj yej nrog cov ntsiab lus caffeine qis. Koj tseem tuaj yeem txo lub sijhawm ua tshuaj yej. Los yog tsuas yog xaiv decaffeinated tshuaj yej thiab kas fes. Ntawm qhov tsis sib xws, yog tias koj nyiam caffeine, koj yuav nyiam espresso, kas fes txias, thiab tshuaj yej nrog cov ntsiab lus caffeine ntau dua.
Txawm hais tias koj nyiam caffeine dua, kev noj caffeine txhua hnub yuav tsum tsis pub tshaj 400 mg, thiab kev noj ib zaug yuav tsum tsis pub tshaj 200 mg. Qhov no txhais tau hais tias koj tuaj yeem haus li 3 mus rau 5 khob ntawm 237 milliliters ntawm kas fes li niaj zaus, lossis 8 khob ntawm 30 milliliters ntawm espresso ib hnub twg.
Cov neeg uas muaj kab mob plawv, ua rau mob migraines, thiab noj qee yam tshuaj yuav tsum txwv tsis pub noj caffeine. Cov poj niam cev xeeb tub lossis cov niam pub niam mis yuav tsum tau hais kom lawv cov tshuaj caffeine txhua hnub tsis pub tshaj 200 mg. Qhov no yog kwv yees li ib khob ntawm 355 milliliters kas fes lossis plaub khob ntawm 237 milliliters ntawm cov tshuaj yej dub.