Airteagal
An dóann aiste bia ísealcharbaihiodráit níos mó calraí?
Ar feadh na mblianta, ceann de na héilimh is coitianta i gcothú ná go ndónn réimeanna ísealcharbaihiodráit níos mó calraí ná réimeanna eile ag an ídiú calrach céanna — "buntáiste meitibileach" a dhéanfadh cailliúint mheáchain níos éasca ag an ídiú céanna. Is éileamh intástáilte é, agus tástáladh é. Seo a léiríonn na huimhreacha i ndáiríre.
An t-éileamh, sonraithe go beacht
Tá an smaoineamh meicníochtúil agus inchreidte ar an dromchla: ardaíonn ídiú carbaihiodráite inslín, cuireann inslín stóráil saille chun cinn agus is féidir léi ocsaídiú saille a chosc, mar sin ba chóir, go teoiriciúil, do réim bia ísealcharbaihiodráit, ísealinsline níos mó fuinnimh a fhágáil ar fáil le dó seachas le stóráil — fiú ag ídiú calrach comhoiriúnaithe. Tugtar múnla carbaihiodráit-inslín na hotrachta air seo uaireanta. Is hipitéis fhíor í le hinchreidteacht bhitheolaíoch fhíor, agus is é sin go díreach an fáth ar thuill sí tástáil dhíreach seachas áit bhuan i mbéaloideas an réim bia.
Cad a fuair na trialacha rialaithe amach
D'fhéach meiteanailís a rinne athanailís ar 29 triail bheathaithe rialaithe go sonrach ar an gceist an méadaíonn réimeanna ísealcharbaihiodráit an caiteachas fuinnimh iomlán i gcomparáid le réimeanna ardcharbaihiodráit ag calraí comhoiriúnaithe [8]. Is é seo an cineál ceart fianaise don cheist seo: baineann beathú rialaithe an earráid thuairiscithe a chráann staidéir réim bia saorchónaithe, agus scarann meaitseáil calraí comhdhéanamh ó laghdú simplí calrach — is beag nach féidir an dá cheann a scaradh murach sin, fadhb a chlúdaíonn leathanach caiteachais fuinnimh an tsuímh seo i gcomhthéacs rianú aiste bia i gcoitinne.
Rinne triail randamaithe ar leith scrúdú ar chaiteachas fuinnimh go sonrach le linn cothabháil chailliúint meáchain ar réim bia ísealcharbaihiodráit, seachas le linn cailliúint ghníomhach [16]. Is í cothabháil an tástáil is deacra agus is ábhartha, ós é seo go díreach an tréimhse ina bhfuil teirmiginéis oiriúnaitheach — an laghdú ar chaiteachas fuinnimh a leanann cailliúint mheáchain, clúdaithe ar leathanach oiriúnaithe meitibileach an tsuímh seo — ag a tábhacht is mó.
D'fhéach tríú staidéar go díreach ar chaiteachas fuinnimh scíthe tar éis cailliúint mheáchain ghníomhach ar fud comhdhéanaimh mhacracothaitheach éagsúla [3].
Ag léamh na dtrialacha go hionraic
| Staidéar | Cad a scarann sé i ndáiríre | Cad nach léiríonn sé |
|---|---|---|
| Athanailís 29 triail ar bheathú rialaithe [8] | An athraíonn ábhar carbaihiodráite féin, ag calraí comhoiriúnaithe, an caiteachas fuinnimh iomlán | An bhfuil aon éifeacht a fuarthas mór go leor le bheith tábhachtach do chailliúint mheáchain sa saol fíor |
| Triail chothabhála ísealcharbaihiodráit [16] | Caiteachas fuinnimh go sonrach le linn na céime cothabhála, ní cailliúint ghníomhach | Marthanacht fhadtéarmach thar fhuinneog leantach na trialach féin |
| Comhdhéanamh macracothaitheach agus caiteachas scíthe tar éis cailliúna [3] | Caiteachas scíthe go sonrach, ní caiteachas laethúil iomlán, a chuimsíonn gníomhaíocht freisin | Cloíteacht saorchónaithe, arb é sin cinntitheoir ar leith agus is minic níos mó ar an toradh |
Is é an patrún ar fud an choirp seo oibre ná go bhfuil éifeacht bhuntáiste meitibiligh, má tá sí ann ar chor ar bith faoi choinníollacha rialaithe go dlúth, beag i gcomparáid leis an éifeacht a bhaineann le níos lú a ithe go simplí — agus ní aistríonn éifeachtaí beaga a thomhaistear faoi choinníollacha beathaithe saotharlainne go hiontaofa go buntáiste bríoch sa saol fíor a luaithe a bhíonn daoine ag beathú iad féin. Ní chiallaíonn sé sin nach bhfuil carbaihiodráit agus inslín ábhartha do rialáil meáchain; ciallaíonn sé nach dtacaíonn an dearadh trialach is láidre atá ar fáil go maith leis an éileamh sonrach go n-ardaíonn srianadh carbaihiodráite na calraí a dhóitear go bríoch, neamhspleách ar a n-itear.
Cá bhfuil tábhacht fós ag baint le scéal na hinsline
Ní shocraíonn aon ní de seo an gcuireann friotaíocht inslín isteach ar rialáil meáchain níos leithne — is ceist ar leith agus níos casta í sin, clúdaithe ar leathanach friotaíocht inslín an tsuímh seo. Socraíonn sé éileamh níos cúinge, sonrach: go n-ardaíonn gearradh carbaihiodráite ag calraí comhoiriúnaithe líon na gcalraí a dhónn do chorp go hiontaofa. Tá an fhianaise thrialach don éileamh sonrach sin lag. Is féidir le réim bia ísealcharbaihiodráit a bheith fós ina bhealach éifeachtach chun meáchan a chailleadh do go leor daoine — de ghnáth trí é a dhéanamh níos éasca níos lú a ithe san iomlán, ní trí bhreis dóite calraí a scaoileadh.
Ceisteanna coitianta
Mar sin, an gcuidíonn gearradh carbaihiodráití ag an leibhéal calrach céanna leat níos mó meáchain a chailleadh?
Cén fáth a mothaíonn daoine go n-"oibríonn" réimeanna ísealcharbaihiodráit dóibh?
An bhfuil múnla carbaihiodráit-inslín na hotrachta mícheart?
An mbaineann sé seo le cailliúint mheáchain ghníomhach agus le cothabháil ar an gcaoi chéanna?
Related reading
- An ndéanann réim bia dochar do do mheitibileacht?
- Friotaíocht inslín, ó thaobh meicníochta de
- An ardaíonn laghdú carbaihiodráití do ráta meitibileach?
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